Example Airshed. Sample January 2019 Monthly Ambient Air Quality Monitoring Report

Transcription

1 Example Airshed Sample January 219 Monthly Ambient Air Quality Monitoring Report 28 February 219 DISCLAIMER: This sample monthly report is provided as guidance only. The structure, look and layout of monthly and annual reports are not mandated. Airsheds are free to include additional or alternative content to that presented here, provided the requirements of the Air Monitoring Directive (AMD) are met. Users of this sample report must consult Chapter 9 Reporting of the AMD for requirements, as the AMD takes precedence. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 1 of 94

2 Pages may be left blank for double-sided printing Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 2 of 94

3 Table of Contents List of Acronyms... 4 Cover Letter... 5 Listing of Facilities... 6 Listing of Continuous Monitoring Stations... 6 Calibration and Data Submission... 6 Noted Events during the Month of January... 6 Station A... 6 Station B... 7 Station C... 7 Station D... 8 Air Incidents... 8 Special Studies... 8 Deviations from Authorized Monitoring Methods... 1 Certification Continuous Network Equipment and Results Summary Station A Station B Station C Station D Charts of Recorded Data Station A Station B Station C Station D End of Report Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 3 of 94

4 List of Acronyms AAAQO AMD CH 4 CO EPEA H 2S NMHC NO NO 2 NO X O 3 PM 2.5 ppb ppm SO 2 THC TRS W/m 2 µg/m 3 Alberta Ambient Air Quality Objective Air Monitoring Directive Methane Carbon Monoxide Environmental Protection and Enhancement Act Hydrogen Sulphide Non-methane hydrocarbons Nitric oxide Nitrogen dioxide Total oxides of nitrogen Ozone Fine particulate matter Parts per billion Parts per million Sulphur Dioxide Total hydrocarbons Total reduced sulphur Watts per square meter Micrograms per cubic meter Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 4 of 94

5 Cover Letter Example Airshed Street Address City, AB Postal Code Phone Number Website 28 February 219 Alberta Environment and Parks 11 th Floor, Oxbridge Place Street Edmonton, Alberta T5K 2J6 ed to: RE: January 219 Monthly Ambient Air Quality Monitoring Report Example Airshed Enclosed is the January 219 Monthly Ambient Air Quality Monitoring Report for the continuous ambient air quality monitoring stations of the Example Airshed regional air quality monitoring network, as operated in the month of January 219. The representative of the Person Responsible for this monitoring program is: Example Airshed Joe Smith, Executive Director Street Address City, AB Postal Code Phone Number Address This report is submitted by Joe Smith, Executive Director, Example Airshed (as above). This report was prepared by John Bee of Monitoring Co., and reviewed by Jane Dee of Example Airshed. Example Airshed has retained the services of Monitoring Co. to conduct continuous ambient monitoring and reporting functions on its behalf. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 5 of 94

6 Listing of Facilities Facilities whose Environmental Protection and Enhancement Act (EPEA) approval ambient monitoring and/or reporting requirements are fulfilled by this monitoring program include those identified in Table 1 below. Table 1: List of Industrial Operations Participating in Airshed Company Name Industrial Operation Name Approval Number Company A Facility 1 -- Yes Facility 2 -- Yes Facility 3 -- Yes Company B Facility 4 -- Yes Company C Facility 5 -- No Company D Facility 6 -- Yes Company E Facility 7 -- Yes This report being submitted on behalf of facility? Listing of Continuous Monitoring Stations The continuous ambient air quality monitoring network stations are: Station A at Beaver Creek Station B at Moose Lodge Station C at Mountain Pass Station D at Greens Hill Calibration and Data Submission Hourly data and calibration reports for January 219 were submitted to Alberta s Ambient Air Data Warehouse for Station A, Station B, Station C and Station D. Noted Events during the Month of January Station A: The following exceedances of Alberta Ambient Air Quality Objectives (AAAQOs) were observed at Station A: Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 6 of 94

7 Table 2: AAAQO Exceedances at Station A Date Time Parameter Avg. Period AAAQO Actual Reading Wind Speed Wind Direction Reference # 7-Jan 7: PM2.5 1-hr 8 µg/m 3 89 µg/m km/h Jan 8: PM2.5 1-hr 8 µg/m 3 18 µg/m km/h Jan 9: PM2.5 1-hr 8 µg/m 3 11 µg/m km/h Jan 1: PM2.5 1-hr 8 µg/m 3 93 µg/m km/h Jan - PM hr 3 µg/m 3 31 µg/m Jan 9: NO2 1-hr 159 ppb ppb 6.8 km/h Jan - PM hr 3 µg/m 3 34 µg/m The possible source of the exceedances of the PM 2.5 guideline and objective on 7-Jan is unknown, but must be localized in nature as only Station A recorded exceedances. The exceedance of the NO 2 objective on 16-Jan is believed to have been caused by large construction equipment idling in closea proximity to Station A. This was observed by station technicians. The exceedance of the PM 2.5 objective on 22-Jan is believed to be the result of local buildup of emissions, given the low wind speeds recorded at the time. All analyzers and sensors at Station A had an operational uptime greater than 9% for the month of January. Station B: The measured ambient air quality for Station B was within the AAAQOs for all monitored parameters. The sulphur dioxide (SO 2) analyzer at Station B operated less than 9% of the time in January 219. A component failure occurred on January 12 following the daily zero/span sequence. Daily system checks indicated that the analyzer performance was within AMD criteria throughout this time period. Upon site investigation on January 16 it was determined that due to a failed solenoid control relay, the analyzer was sampling through the zero/span lines rather than the ambient air sample line. The solenoid control was repaired and the analyzer was returned to normal operation. During the data validation process, the SO 2 data were invalidated for a total of 144 hours between January 11 and 17, 219. This resulted in the THC analyzer data at Station B being available for 8% of the month of January. This incident was reported to Alberta Environment and Parks on January 16, 217 (Reference #222222). Non-standard conditions were experienced at Station B on 15-Jan when a spider in the nephelometer of the PM 2.5 analyzer disrupted normal operation. 2 hours of instrument operation time were lost in this event. All other analyzers and sensors at Station B had an operational uptime greater than 9% for the month of January. Station C: The following exceedances of AAAQOs were observed at Station C: Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 7 of 94

8 Table 3: AAAQO Exceedances at Station C Date Time Parameter Avg. Period AAAQO Actual Reading Wind Wind Reference # Speed Direction 25-12: PM2.5 1-hr 8 µg/m µg/m km/h Jan 25-13: PM2.5 1-hr 8 µg/m µg/m km/h 132 Jan 25- Jan 14: PM2.5 1-hr 8 µg/m µg/m km/h 139 The exceedances of the PM 2.5 guideline on 25-Jan are believed to be the result of smoke from a known nearby structure fire, in the direction of wind flow. Readings for two of the three hours (13: and 14:) exceeded the instrument quantification limits, with the actual readings presented being reported as equal to the quantification limit. During a station audit on 17-Jan, it was discovered that the wind sensor was loose and misaligned. At this time, the sensor was removed from the met tower, recalibrated, and reinstalled. It is not known at what point the sampler became loose, so all wind speed and direction data collected since the last audit (24-Mar-218) must be discarded. For this reason, these data were removed from Alberta s Ambient Air Data Warehouse on 18-Jan. Station D: The measured ambient air quality for Station D was within the AAAQOs for all monitored parameters. The THC analyzer was due to be calibrated on 27-Jan. However, the temperature and relative humidity analyzer issues at Station A required the attendance of the technician, and this calibration had to be rescheduled to 2-Feb. Passive Stations: There were no exceedances of the AAAQOs for all monitored parameters at any of the passive stations during this month. Air Incidents Example Airshed was made aware of an upset at Company D, Facility 6 which Company D reported to the response centre on 13-Jan (Reference #444444). This involved the release of an odorous compound. While there were odour reports from the public to the facility, wind conditions were such that this was not detected at permanent monitoring locations in Example Airshed. Special Studies A PM 2.5 speciation study was initiated in January 219 at Station A. 24-hour samples of PM 2.5 were collected on 17-Jan, 23-Jan, and 29-Jan. This sampling was performed in accordance with AMD criteria. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 8 of 94

9 Analysis of these samples will be performed by ACME Laboratories. Results will be forwarded to Environment and Parks when they are available. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 9 of 94

10 Deviations from Authorized Monitoring Methods A tree nearby to Station B exceeds the height allowed under section 2.3 of the siting criteria in Chapter 3 of the AMD. This variance was authorized in writing by the director on September 3, 218. Certification I certify that I have reviewed and verified this report and that the information is complete, accurate and representative of the monitoring results, reporting timeframe and the specified analysis, summarization and reporting requirements. Joe Smith, Executive Director, Example Airshed February 28, 219 Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 1 of 94

11 1 Continuous Network Equipment and Results Summary 1.1 Station A Table 4: Equipment Operation Summary for Station A Parameter Make Model Notes SO 2 TEI 43x No operational issues observed. NO/NO 2/NO X TEI 42x No operational issues observed. O 3 TEI 49x Instrument malfunction on 1- and 11-Jan led to 25 hours of lost operational time. These hours were flagged as X for machine malfunction. Operational time and valid data remained above 9%. CO TEI 48x No operational issues observed. CH 4/NMHC/THC TEI 55x No operational issues observed. H2S TEI 45x No operational issues observed. PM 2.5 SHARP 53 No operational issues observed. Rel. Humidity Met One 83D Instrument malfunctions on 12-, 25-, and 27-Jan led to a total of 6 hours of lost operational time. These hours were flagged as X for machine malfunction. Operational time and valid data remained above 9%. Ext. Temp. Met One 83D Instrument malfunctions on 12-, 25-, and 27-Jan led to a total of 6 hours of lost operational time. These hours were flagged as X for machine malfunction. Operational time and valid data remained above 9%. Wind S/D Met One 1C/2C No operational issues observed. Table 5: Monitored Data Summary for Station A Parameter (units) Objective/Guideline Exceedances Monthly Statistics 1H 8H 24H 3D 1H 8H 24H 3D Min. Avg. Max 1H Date- Time Max 24H Date Operational time Valid Data Calibration Date SO2 (ppb) Jan 15: 2 3-Jan 1.% 95.4% 12-Jan NO (ppb) Jan 1: Jan 1.% 95.2% 13-Jan NO2 (ppb) Jan 9: Jan 1.% 95.2% 13-Jan NOX (ppb) Jan 1: Jan 1.% 95.2% 13-Jan O3 (ppb) Jan 17: 4 28-Jan 96.6% 92.1% 13-Jan CO(ppm) Jan 5:.6 2-Jan 1.% 95.3% 1-Jan CH4 (ppm) Jan 17: Jan 1.% 95.3% 1-Jan NMHC (ppm) Jan 6:.1 7-Jan 1.% 95.3% 1-Jan THC (ppm) Jan 17: Jan 1.% 95.3% 1-Jan H2S (ppb) Jan 18: 1 12-Jan 1.% 95.4% 12-Jan PM2.5 (µg/m 3 ) Jan 8: Jan 1.% 99.7% 13-Jan Rel Humidity (%) Jan 6: Jan 99.2% 99.2% - Ext. Temp. ( C) Jan 13: 8 17-Jan 99.2% 99.2% - W. Speed (km/h) Jan 19: Jan 1.% 1.% 12-Jun W. Direction ( ) Jan 15: % 1.% 12-Jun Date given is the most recent time the instrument was calibrated. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 11 of 94

12 1.2 Station B Table 6: Equipment Operation Summary for Station B Parameter Make Model Notes SO 2 TEI 43x An equipment failure on 12-Jan led to 144 hours of lost operational time from 11- to 17-Jan. These hours were flagged as X for machine malfunction. Operational time and valid data were less than 9% for the month of January, at 8.% and 78.5% respectively. NO/NO 2/NO X TEI 42x See note below. O 3 TEI 49x See note below. CO TEI 48x See note below. CH 4/NMHC/THC TEI 55x See note below. A machine malfunction led to 1 hour of lost data on 27-Jan. This hour was flagged as X for machine malfunction. H2S TEI 45x See note below. PM 2.5 SHARP 53 A spider in the nephelometer on 15-Jan led to 8 hours of lost operational time. 2 of these hours were flagged as X for machine malfunction, 6 were flagged as Y for Maintenance. Operational time and valid data remained above 9%. Rel. Humidity Met One 83D See note below. Ext. Temp. Met One 83D See note below. Wind S/D Met One 1C/2C See note below. Note: A recording system failure led to 5 hours of lost data on all channels on 3-Jan. These hours were flagged as K for recording system failure. All instruments appear to have been operational through this period; however the monitored data could not be recovered. Table 7: Monitored Data Summary for Station B Parameter (units) Objective/Guideline Exceedances Monthly Statistics 1H 8H 24H 3D 1H 8H 24H 3D Min. Avg. Max 1H Date Time Max 24H Date Operational time Valid Data Calibration Date SO2 (ppb) Jan 14: 3 24-Jan 8.% 78.5% 25-Jan NO (ppb) Jan 13: Jan 99.3% 98.% 25-Jan NO2 (ppb) Jan 18: Jan 99.3% 98.% 25-Jan NOX (ppb) Jan 13: Jan 99.3% 98.% 25-Jan O3 (ppb) Jan 18: 35 3-Jan 99.3% 97.2% 26-Jan CO(ppm) Jan 18:.5 17-Jan 99.3% 98.3% 25-Jan CH4 (ppm) Jan 3: Jan 99.2% 98.1% 25-Jan NMHC (ppm) Jan 2:.2 21-Jan 99.2% 98.1% 25-Jan THC (ppm) Jan 3: Jan 99.2% 98.1% 25-Jan H2S (ppb) Jan 1: 1 17-Jan 99.3% 98.9% 12-Jan PM2.5 (µg/m 3 ) Jan 12: Jan 99.1% 96.5% - Rel Humidity (%) Jan 18: 9 21-Jan 99.3% 98.7% - Ext. Temp. ( C) Jan 13: 6 18-Jan 99.3% 98.7% - W. Speed (km/h) Jan 18: 22 3-Jan 99.3% 99.3% 23-Jul W. Direction ( ) Jan 14: % 99.3% 23-Jul Date given is the most recent time the instrument was calibrated. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 12 of 94

13 1.3 Station C Table 8: Equipment Operation Summary for Station C Parameter Make Model Notes SO 2 TEI 43x No operational issues observed. NO/NO 2/NO X TEI 42x No operational issues observed. O 3 TEI 49x No operational issues observed. CO TEI 48x No operational issues observed. CH 4/NMHC/THC TEI 55x No operational issues observed. TRS TEI 45x No operational issues observed. PM 2.5 BAM 12 A nearby structure fire resulted in three hours of PM 2.5 in excess of the 1-hour Guideline on 25-Jan. Two of these hours exceeded instrument quantification limits. This also resulted in an exceedance of the 24-hour Objective on the same date. Rel. Humidity Met One 83D No operational issues observed. Ext. Temp. Met One 83D No operational issues observed. Wind S/D Met One 1C/2C An audit on 17-Jan revealed that the wind sampler was misaligned. This was corrected and the instrument recalibrated on that date. Due to this issue, 398 hours of data were lost in the month of January; these hours were flagged as X for machine malfunction. As a result of the data loss, both operational time and valid data were below 9%, at 46.5%. Table 9: Monitored Data Summary for Station C Parameter (units) Objective/Guideline Exceedances Monthly Statistics 1H 8H 24H 3D 1H 8H 24H 3D Min. Avg. Max 1H Date Time Max 24H Date Operational time Valid Data Calibration Date SO2 (ppb) Jan 1: 6 19-Jan 1.% 95.2% 5-Jan NO (ppb) Jan 1: Jan 1.% 94.9% 5-Jan NO2 (ppb) Jan 16: Jan 1.% 94.9% 5-Jan NOX (ppb) Jan 17: Jan 1.% 94.9% 5-Jan O3 (ppb) Jan 11: Jan 1.% 95.3% 3-Jan CO(ppm) Jan 17:.3 13-Jan 1.% 95.4% 6-Jan CH4 (ppm) Jan 4: Jan 1.% 95.2% 5-Jan NMHC (ppm).4 2-Jan 5:.2 2-Jan 1.% 95.2% 5-Jan THC (ppm) Jan 4: Jan 1.% 95.2% 5-Jan TRS (ppb) Jan 6: 1 19-Jan 1.% 95.3% 3-Jan PM2.5 (µg/m 3 ) Jan 13: Jan 1.% 1.% - Rel Humidity (%) Jan 22: Jan 1.% 1.% - Ext. Temp. ( C) Jan 16: Jan 1.% 1.% - W. Speed (km/h) Jan 1: Jan 46.5% 46.5% 17-Jan W. Direction ( ) Jan 9: Jan 46.5% 46.5% 17-Jan Date given is the most recent time the instrument was calibrated. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 13 of 94

14 1.4 Station D Table 1: Equipment Operation Summary for Station D Parameter Make Model Notes SO2 TEI 43x No operational issues observed. NO/NO2/NOX TEI 42x No operational issues observed. O3 TEI 49x No operational issues observed. THC TEI 55x A calibration scheduled for 27-Jan had to be rescheduled for 2-Feb to address the recording system issue at Station A. PM2.5 R&P 14AB Analyzer replaced with SHARP 53 on 16-Jan. Monitoring was unavailable for 4 hours during equipment change and setup. These hours were flagged as N for not in service. Operational time and valid data remained above 9%. Rel. Humidity Met One 83D No operational issues observed. Ext. Temp. Met One 83D No operational issues observed. Solar Rad. Met One 96-1 No operational issues observed. Table 11: Monitored Data Summary for Station D Parameter (units) Objective/Guideline Exceedances Monthly Statistics 1H 8H 24H 3D 1H 8H 24H 3D Min. Avg. Max 1H Date Time Max 24H Date Operational time Valid Data Calibration Date SO2 (ppb) Jan : 4 23-Jan 1.% 95.3% 2-Jan NO (ppb) Jan : Jan 1.% 95.2% 2-Jan NO2 (ppb) Jan 18: 9 13-Jan 1.% 95.2% 2-Jan NOX (ppb) Jan : Jan 1.% 95.2% 2-Jan O3 (ppb) Jan 22: 42 3-Jan 1.% 95.3% 2-Jan THC (ppm) Jan 17: Jan 1.% 95.8% 28-Dec PM2.5 (µg/m 3 ) Jan 14: Jan 1.% 99.5% 16-Jan Rel Humidity (%) Jan 19: Jan 1.% 1.% - Ext. Temp. ( C) Jan 15: Jan 1.% 1.% - Sol. Rad. (W/m 2 ) Jan 14: Jan 1.% 1.% - 1 Calibration scheduled for 27-Jan had to be rescheduled into February; date given is the most recent time the instrument was calibrated. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 14 of 94

15 2 Charts of Recorded Data 2.1 Station A Timeseries Chart of Hourly Averages for SO₂ - Station A 2 18 Concentration (ppb) Hours Operational: 744 (1.%) Hours of Valid Data: 71 (95.4%) Data Qualifier Flag Summary: C - Calibration (3 hours) S - Daily Zero/Span (31 hours) Value (N=71) AAAQO (172 ppb) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 15 of 94

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17 Timeseries Chart of Hourly Averages for NO - Station A Hours Operational: 744 (1.%) Hours of Valid Data: 78 (95.2%) Data Qualifier Flag Summary: C - Calibration (5 hours) S - Daily Zero/Span (31 hours) 14 Concentration (ppb) Value (N=78) Note: Elevated NO recorded on 18-Jan, however instrument appears to have been operating properly. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 17 of 94

18 Timeseries Chart of Hourly Averages for NO₂ - Station A Hours Operational: 744 (1.%) Hours of Valid Data: 78 (95.2%) Data Qualifier Flag Summary: C - Calibration (5 hours) S - Daily Zero/Span (31 hours) Concentration (ppb) Value (N=78) AAAQO (159 ppb) Note: Exceedance of 1-hour Objective on 16-Jan likely due to construction equipment idling near station. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 18 of 94

19 Histogram of Hourly NO₂ Readings - Station A Percentiles: 1st: 3.4 ppb 5th: 5.3 ppb 1th: 7.5 ppb 25th: 13.4 ppb 5th: 26.1 ppb 75th: 44.3 ppb 9th: ppb 95th: 79.8 ppb 99th: ppb Number of Hours >159 Concentration (ppb) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 19 of 94

20 Timeseries Chart of Hourly Averages for NOx - Station A Hours Operational: 744 (1.%) Hours of Valid Data: 78 (95.2%) Data Qualifier Flag Summary: C - Calibration (5 hours) S - Daily Zero/Span (31 hours) 14 Concentration (ppb) Value (N=78) Note: Elevated NO recorded on 18-Jan, mainly due to NO component, however instrument appears to have been operating properly. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 2 of 94

21 Timeseries Chart of Hourly Averages for O₃ - Station A 9 Concentration (ppb) Hours Operational: 719 (96.6%) Hours of Valid Data: 685 (92.1%) Data Qualifier Flag Summary: C - Calibration (3 hours) S - Daily Zero/Span (3 hours) X* - Machine Malfunction (25 hours) Y - Maintenance (1 hours) *Non-operational hours Value (N=685) AAAQO (82 ppb) Note: 25 hours of lost data on 1- and 11-Jan. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 21 of 94

22 Histogram of Hourly O₃ Readings - Station A Percentiles: 1st: 1 ppb 5th: 3 ppb 1th: 5 ppb 25th: 9 ppb 5th: 17 ppb 75th: 26 ppb 9th: 35.1 ppb 95th: 39 ppb 99th: 44 ppb Number of Hours >82 Concentration (ppb) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 22 of 94

23 Timeseries Chart of Hourly Averages for CO - Station A Hours Operational: 744 (1.%) Hours of Valid Data: 79 (95.3%) Data Qualifier Flag Summary: C - Calibration (4 hours) S - Daily Zero/Span (31 hours) Concentration (ppm) Value (N=79) AAAQO (13 ppm) Note: Short spike on 24-Jan. Instrument appears to have been operating correctly. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 23 of 94

24 Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 24 of 94

25 Timeseries Chart of Hourly Averages for CH₄ - Station A Hours Operational: 744 (1.%) Hours of Valid Data: 79 (95.3%) Data Qualifier Flag Summary: C - Calibration (4 hours) S - Daily Zero/Span (31 hours) Concentration (ppm) Value (N=79) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 25 of 94

26 Timeseries Chart of Hourly Averages for NMHC - Station A Hours Operational: 744 (1.%) Hours of Valid Data: 79 (95.3%) Data Qualifier Flag Summary: C - Calibration (4 hours) S - Daily Zero/Span (31 hours).8 Concentration (ppm) Value (N=79) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 26 of 94

27 Timeseries Chart of Hourly Averages for THC - Station A Hours Operational: 744 (1.%) Hours of Valid Data: 79 (95.3%) Data Qualifier Flag Summary: C - Calibration (4 hours) S - Daily Zero/Span (31 hours) 3 Concentration (ppm) Value (N=79) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 27 of 94

28 Timeseries Chart of Hourly Averages for H₂S - Station A 12 Concentration (ppb) Hours Operational: 744 (1.%) Hours of Valid Data: 71 (95.4%) Data Qualifier Flag Summary: C - Calibration (3 hours) S - Daily Zero/Span (31 hours) Value (N=71) AAAQO (1 ppb) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 28 of 94

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30 Timeseries Chart of Hourly Averages for PM₂.₅ - Station A 12 1 Hours Operational: 744 (1.%) Hours of Valid Data: 742 (99.7%) Data Qualifier Flag Summary: C - Calibration (2 hours) Concentration (µg/m³) Value (N=742) AAAQO (8 µg/m³) Note: 4 hours in exceedance of 1-hour Guideline on 7-Jan. 24-hour Objective exceeded on 7-Jan and 22-Jan. Cause is unknown. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 3 of 94

31 Histogram of Hourly PM₂.₅ Readings - Station A Percentiles: 1st: 1 µg/m³ 5th: 1 µg/m³ 1th: 2 µg/m³ 25th: 3 µg/m³ 5th: 5 µg/m³ 75th: 1 µg/m³ 9th: 24 µg/m³ 95th: 29 µg/m³ 99th: µg/m³ Number of Hours >8 Concentration (µg/m³) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 31 of 94

32 Timeseries Chart of Hourly Averages for Rel. Humidity - Station A Humidity (%) Hours Operational: 738 (99.2%) Hours of Valid Data: 738 (99.2%) Data Qualifier Flag Summary: X* - Machine Malfunction (6 hours) *Non-operational hours Value (N=738) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 32 of 94

33 Timeseries Chart of Hourly Averages for Ext. Temp. - Station A Hours Operational: 738 (99.2%) Hours of Valid Data: 738 (99.2%) Data Qualifier Flag Summary: X* - Machine Malfunction (6 hours) *Non-operational hours Temperature ( C) Value (N=738) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 33 of 94

34 Timeseries Chart of Hourly Averages for W. Speed - Station A 35 3 Hours Operational: 744 (1.%) Hours of Valid Data: 744 (1.%) No Data Qualifier Flags to Report 25 Wind Speed (km/h) Value (N=744) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 34 of 94

35 Timeseries Chart of Hourly Averages for W. Direction - Station A Wind Direction ( ) Hours Operational: 744 (1.%) Hours of Valid Data: 744 (1.%) No Data Qualifier Flags to Report Value (N=744) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 35 of 94

36 Windrose - Station A NW (315 ) NNW N ( ) 35% 3% 25% NNE NE (45 ) 2% WNW W (27 ) 15% 1% 5% % ENE E (9 ) km/hr km/hr 8-11 km/hr 5-8 km/hr 3-5 km/hr WSW ESE -3 km/hr SW (225 ) SE (135 ) SSW SSE S (18 ) Note: Wind instrument last calibrated on 12-Jun-218. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 36 of 94

37 2.2 Station B Timeseries Chart of Hourly Averages for SO₂ - Station B 2 18 Concentration (ppb) Hours Operational: 595 (8.%) Hours of Valid Data: 584 (78.5%) Data Qualifier Flag Summary: C - Calibration (8 hours) K* - Recording system failure (5 hours) X* - Machine Malfunction (144 hours) Y - Maintenance (3 hours) *Non-operational hours Value (N=584) AAAQO (172 ppb) Note: Instrument malfunction led to 144 hours of lost data from 11- to 17-Jan. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 37 of 94

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39 Timeseries Chart of Hourly Averages for NO - Station B Hours Operational: 739 (99.3%) Hours of Valid Data: 729 (98.%) Data Qualifier Flag Summary: C - Calibration (7 hours) K* - Recording system failure (5 hours) Y - Maintenance (3 hours) *Non-operational hours Concentration (ppb) Value (N=729) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 39 of 94

40 Timeseries Chart of Hourly Averages for NO₂ - Station B Concentration (ppb) Hours Operational: 739 (99.3%) Hours of Valid Data: 729 (98.%) Data Qualifier Flag Summary: C - Calibration (7 hours) K* - Recording system failure (5 hours) Y - Maintenance (3 hours) *Non-operational hours Value (N=729) AAAQO (159 ppb) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 4 of 94

41 Histogram of Hourly NO₂ Readings - Station B Percentiles: 1st: 4.4 ppb 5th: 6.4 ppb 1th: 8.6 ppb 25th: 13.3 ppb 5th: 21.9 ppb 75th: ppb 9th: 35.6 ppb 95th: 38.4 ppb 99th: ppb Number of Hours >159 Concentration (ppb) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 41 of 94

42 Timeseries Chart of Hourly Averages for NOx - Station B Hours Operational: 739 (99.3%) Hours of Valid Data: 729 (98.%) Data Qualifier Flag Summary: C - Calibration (7 hours) K* - Recording system failure (5 hours) Y - Maintenance (3 hours) *Non-operational hours Concentration (ppb) Value (N=729) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 42 of 94

43 Timeseries Chart of Hourly Averages for O₃ - Station B 9 Concentration (ppb) Hours Operational: 739 (99.3%) Hours of Valid Data: 723 (97.2%) Data Qualifier Flag Summary: C - Calibration (7 hours) K* - Recording system failure (5 hours) Y - Maintenance (9 hours) *Non-operational hours Value (N=723) AAAQO (82 ppb) Note: Loss of available data on 26-Jan during calibration was coincident with an increase in ambient ozone concentrations, giving spurious appearance of a baseline shift, however instrument operation was normal before and after calibration. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 43 of 94

44 Histogram of Hourly O₃ Readings - Station B Percentiles: 1st: 1 ppb 5th: 1.5 ppb 1th: 4 ppb 25th: 1 ppb 5th: 17 ppb 75th: 23 ppb 9th: 3 ppb 95th: 34 ppb 99th: 37 ppb Number of Hours >82 Concentration (ppb) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 44 of 94

45 Timeseries Chart of Hourly Averages for CO - Station B 14 Concentration (ppm) Hours Operational: 739 (99.3%) Hours of Valid Data: 731 (98.3%) Data Qualifier Flag Summary: C - Calibration (5 hours) K* - Recording system failure (5 hours) Y - Maintenance (3 hours) *Non-operational hours Value (N=731) AAAQO (13 ppm) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 45 of 94

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47 Timeseries Chart of Hourly Averages for CH₄ - Station B Concentration (ppm) Hours Operational: 738 (99.2%) Hours of Valid Data: 73 (98.1%) Data Qualifier Flag Summary: C - Calibration (9 hours) K* - Recording system failure (5 hours) X* - Machine Malfunction (1 hours) Y - Maintenance (3 hours) *Non-operational hours Value (N=73) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 47 of 94

48 Timeseries Chart of Hourly Averages for NMHC - Station B Hours Operational: 738 (99.2%) Hours of Valid Data: 73 (98.1%) Data Qualifier Flag Summary: C - Calibration (9 hours) K* - Recording system failure (5 hours) X* - Machine Malfunction (1 hours) Y - Maintenance (3 hours) *Non-operational hours Concentration (ppm) Value (N=73) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 48 of 94

49 Timeseries Chart of Hourly Averages for THC - Station B Concentration (ppm) Hours Operational: 738 (99.2%) Hours of Valid Data: 73 (98.1%) Data Qualifier Flag Summary: C - Calibration (9 hours) K* - Recording system failure (5 hours) X* - Machine Malfunction (1 hours) Y - Maintenance (3 hours) *Non-operational hours Value (N=73) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 49 of 94

50 Timeseries Chart of Hourly Averages for H₂S - Station B 12 1 Concentration (ppb) Hours Operational: 739 (99.3%) Hours of Valid Data: 736 (98.9%) Data Qualifier Flag Summary: C - Calibration (3 hours) K* - Recording system failure (5 hours) *Non-operational hours Value (N=736) AAAQO (1 ppb) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 5 of 94

51 Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 51 of 94

52 Timeseries Chart of Hourly Averages for PM₂.₅ - Station B 9 8 Concentration (µg/m³) Hours Operational: 731 (98.3%) Hours of Valid Data: 729 (98.%) Data Qualifier Flag Summary: K* - Recording system failure (5 hours) Q - Quality Assurance (2 hours) X* - Machine Malfunction (2 hours) Y* - Maintenance (6 hours) *Non-operational hours Value (N=729) AAAQO (8 µg/m³) Note: 6 hours total lost on 15-Jan due to spider in nephelometer. Data from 3- to 31-Jan appears flat, but instrument is believed to have been operating correctly. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 52 of 94

53 Histogram of Hourly PM₂.₅ Readings - Station B Percentiles: 1st: 1 µg/m³ 5th: 1 µg/m³ 1th: 2 µg/m³ 25th: 4 µg/m³ 5th: 7 µg/m³ 75th: 1 µg/m³ 9th: 17 µg/m³ 95th: 22 µg/m³ 99th: 3.8 µg/m³ Number of Hours >8 Concentration (µg/m³) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 53 of 94

54 Timeseries Chart of Hourly Averages for Rel. Humidity - Station B Humidity (%) Hours Operational: 739 (99.3%) Hours of Valid Data: 734 (98.7%) Data Qualifier Flag Summary: K* - Recording system failure (5 hours) Q - Quality Assurance (2 hours) Y - Maintenance (3 hours) *Non-operational hours Value (N=734) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 54 of 94

55 Timeseries Chart of Hourly Averages for W. Speed - Station B Hours Operational: 739 (99.3%) Hours of Valid Data: 739 (99.3%) Data Qualifier Flag Summary: K* - Recording system failure (5 hours) *Non-operational hours Wind Speed (km/h) Value (N=739) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 55 of 94

56 Timeseries Chart of Hourly Averages for W. Speed - Station B Wind Direction ( ) Hours Operational: 739 (99.3%) Hours of Valid Data: 739 (99.3%) Data Qualifier Flag Summary: K* - Recording system failure (5 hours) *Non-operational hours Value (N=739) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 56 of 94

57 Windrose - Station B NNW N ( ) 25% NNE NW (315 ) 2% NE (45 ) 15% WNW 1% ENE km/hr W (27 ) 5% % E (9 ) km/hr 1-12 km/hr 7-1 km/hr 5-7 km/hr WSW ESE -5 km/hr SW (225 ) SE (135 ) SSW S (18 ) SSE Note: Wind instrument last calibrated on 23-Jul-218. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 57 of 94

58 2.3 Station C Timeseries Chart of Hourly Averages for SO₂ - Station C 2 18 Concentration (ppb) Hours Operational: 744 (1.%) Hours of Valid Data: 78 (95.2%) Data Qualifier Flag Summary: C - Calibration (5 hours) S - Daily Zero/Span (31 hours) Value (N=78) AAAQO (172 ppb) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 58 of 94

59 Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 59 of 94

60 Timeseries Chart of Hourly Averages for NO - Station C Hours Operational: 744 (1.%) Hours of Valid Data: 76 (94.9%) Data Qualifier Flag Summary: C - Calibration (5 hours) S - Daily Zero/Span (31 hours) Y - Maintenance (2 hours) Concentration (ppb) Value (N=76) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 6 of 94

61 Timeseries Chart of Hourly Averages for NO₂ - Station C Concentration (ppb) Hours Operational: 744 (1.%) Hours of Valid Data: 76 (94.9%) Data Qualifier Flag Summary: C - Calibration (5 hours) S - Daily Zero/Span (31 hours) Y - Maintenance (2 hours) Value (N=76) AAAQO (159 ppb) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 61 of 94

62 Histogram of Hourly NO₂ Readings - Station C Percentiles: 1st: 1.5 ppb 5th: 2.7 ppb 1th: 3.6 ppb 25th: 6.48 ppb 5th: 11.3 ppb 75th: 15.7 ppb 9th: 21.3 ppb 95th: ppb 99th: 3.81 ppb Number of Hours >159 Concentration (ppb) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 62 of 94

63 Timeseries Chart of Hourly Averages for NOx - Station C 12 1 Hours Operational: 744 (1.%) Hours of Valid Data: 76 (94.9%) Data Qualifier Flag Summary: C - Calibration (5 hours) S - Daily Zero/Span (31 hours) Y - Maintenance (2 hours) 8 Concentration (ppb) Value (N=75) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 63 of 94

64 Timeseries Chart of Hourly Averages for O₃ - Station C 9 Concentration (ppb) Hours Operational: 744 (1.%) Hours of Valid Data: 79 (95.3%) Data Qualifier Flag Summary: C - Calibration (3 hours) S - Daily Zero/Span (31 hours) Y - Maintenance (1 hours) Value (N=79) AAAQO (82 ppb) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 64 of 94

65 Histogram of Hourly O₃ Readings - Station C Number of Hours Percentiles: 1st: 4 ppb 5th: 6 ppb 1th: 8 ppb 25th: 15 ppb 5th: 22 ppb 75th: 29 ppb 9th: 33 ppb 95th: 36 ppb 99th: 39 ppb >82 Concentration (ppb) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 65 of 94

66 Timeseries Chart of Hourly Averages for CO - Station C Hours Operational: 744 (1.%) Hours of Valid Data: 71 (95.4%) Data Qualifier Flag Summary: C - Calibration (3 hours) S - Daily Zero/Span (3 hours) Y - Maintenance (1 hours) Concentration (ppm) Value (N=71) AAAQO (13 ppm) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 66 of 94

67 Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 67 of 94

68 Timeseries Chart of Hourly Averages for CH₄ - Station C Hours Operational: 744 (1.%) Hours of Valid Data: 78 (95.2%) Data Qualifier Flag Summary: C - Calibration (5 hours) S - Daily Zero/Span (31 hours) 2.5 Concentration (ppm) Value (N=78) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 68 of 94

69 Timeseries Chart of Hourly Averages for NMHC - Station C Hours Operational: 744 (1.%) Hours of Valid Data: 78 (95.2%) Data Qualifier Flag Summary: C - Calibration (5 hours) S - Daily Zero/Span (31 hours).3 Concentration (ppm) Value (N=78) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 69 of 94

70 Timeseries Chart of Hourly Averages for THC - Station C Hours Operational: 744 (1.%) Hours of Valid Data: 78 (95.2%) Data Qualifier Flag Summary: C - Calibration (5 hours) S - Daily Zero/Span (31 hours) 2.5 Concentration (ppm) Value (N=78) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 7 of 94

71 Timeseries Chart of Hourly Averages for TRS - Station C Hours Operational: 744 (1.%) Hours of Valid Data: 79 (95.3%) Data Qualifier Flag Summary: C - Calibration (3 hours) S - Daily Zero/Span (31 hours) Y - Maintenance (1 hours) Concentration (ppb) Value (N=79) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 71 of 94

72 Timeseries Chart of Hourly Averages for PM₂.₅ - Station C 25 2 Hours Operational: 744 (1.%) Hours of Valid Data: 744 (1.%) No Data Qualifier Flags to Report Concentration (µg/m³) Value (N=744) AAAQO (8 µg/m³) Note: Spike on 25-Jan exceeded instrument quantification limits, and AAAQO, for 2 hours. This is believed to be the result of smoke from a nearby structure fire. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 72 of 94

73 Histogram of Hourly PM₂.₅ Readings - Station C Percentiles: 1st: 1 µg/m³ 5th: 2 µg/m³ 1th: 2 µg/m³ 25th: 3 µg/m³ 5th: 5 µg/m³ 75th: 8 µg/m³ 9th: 13 µg/m³ 95th: 16 µg/m³ 99th: µg/m³ Number of Hours >8 Concentration (µg/m³) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 73 of 94

74 Timeseries Chart of Hourly Averages for Rel. Humidity - Station C 12 1 Hours Operational: 744 (1.%) Hours of Valid Data: 744 (1.%) No Data Qualifier Flags to Report 8 Humidity (%) Value (N=744) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 74 of 94

75 1 5 Timeseries Chart of Hourly Averages for Ext. Temp. - Station C Hours Operational: 744 (1.%) Hours of Valid Data: 744 (1.%) No Data Qualifier Flags to Report Temperature ( C) Value (N=744) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 75 of 94

76 Timeseries Chart of Hourly Averages for Wind Spd. - Station C 35 3 Hours Operational: 346 (46.5%) Hours of Valid Data: 346 (46.5%) Data Qualifier Flag Summary: X* - Machine Malfunction (398 hours) *Non-operational hours 25 Speed (km/h) Value (N=346) Note: Timeseries plot generated with 346 hours of available wind data (46.5%) following realignment of wind sampler on 17-Jan. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 76 of 94

77 Timeseries Chart of Hourly Averages for Wind Direction - Station C Hours Operational: 346 (46.5%) Hours of Valid Data: 346 (46.5%) Data Qualifier Flag Summary: X* - Machine Malfunction (398 hours) *Non-operational hours Wind Direction ( ) Value (N=346) Note: Timeseries plot generated with 346 hours of available wind data (46.5%) following realignment of wind sampler on 17-Jan. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 77 of 94

78 Windrose - Station C NNW N ( ) 2% NNE NW (315 ) 15% NE (45 ) WNW 1% 5% ENE 16-3 km/hr 1-16 km/hr W (27 ) % E (9 ) 6-1 km/hr 4-6 km/hr 3-4 km/hr WSW ESE -3 km/hr SW (225 ) SE (135 ) SSW S (18 ) SSE Note: Windrose generated with 346 hours of available wind data (46.5%) following realignment of wind sampler on 17-Jan. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 78 of 94

79 2.4 Station D Timeseries Chart of Hourly Averages for SO₂ - Station D 2 18 Concentration (ppb) Hours Operational: 744 (1.%) Hours of Valid Data: 79 (95.3%) Data Qualifier Flag Summary: C - Calibration (4 hours) S - Daily Zero/Span (31 hours) Value (N=79) AAAQO (172 ppb) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 79 of 94

80 Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 8 of 94

81 Timeseries Chart of Hourly Averages for NO - Station D Hours Operational: 744 (1.%) Hours of Valid Data: 78 (95.2%) Data Qualifier Flag Summary: C - Calibration (5 hours) S - Daily Zero/Span (31 hours) 7 Concentration (ppb) Value (N=78) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 81 of 94

82 Timeseries Chart of Hourly Averages for NO₂ - Station D Hours Operational: 744 (1.%) Hours of Valid Data: 78 (95.2%) Data Qualifier Flag Summary: C - Calibration (5 hours) S - Daily Zero/Span (31 hours) Concentration (ppb) Value (N=78) AAAQO (159 ppb) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 82 of 94

83 Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 83 of 94

84 Timeseries Chart of Hourly Averages for NOx - Station D 25 2 Hours Operational: 744 (1.%) Hours of Valid Data: 78 (95.2%) Data Qualifier Flag Summary: C - Calibration (5 hours) S - Daily Zero/Span (31 hours) Concentration (ppb) Value (N=78) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 84 of 94

85 Timeseries Chart of Hourly Averages for O₃ - Station D Hours Operational: 744 (1.%) Hours of Valid Data: 79 (95.3%) Data Qualifier Flag Summary: C - Calibration (4 hours) S - Daily Zero/Span (31 hours) Concentration (ppb) Value (N=79) AAAQO (82 ppb) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 85 of 94

86 Histogram of Hourly O₃ Readings - Station D Percentiles: 1st: 9.8 ppb 5th: 15 ppb 1th: 18 ppb 25th: 25 ppb 5th: 31 ppb 75th: 37 ppb 9th: 41 ppb 95th: 43 ppb 99th: ppb Number of Hours >82 Concentration (ppb) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 86 of 94

87 Timeseries Chart of Hourly Averages for THC - Station D Hours Operational: 744 (1.%) Hours of Valid Data: 713 (95.8%) Data Qualifier Flag Summary: C - Calibration (8 hours) S - Daily Zero/Span (31 hours) 6 Concentration (ppm) Value (N=713) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 87 of 94

88 Timeseries Chart of Hourly Averages for PM₂.₅ - Station D 9 Concentration (µg/m³) Hours Operational: 74 (99.5%) Hours of Valid Data: 74 (99.5%) Data Qualifier Flag Summary: N* - Not in Service (4 hours) *Non-operational hours Value (N=74) AAAQO (8 µg/m³) Note: TEOM analyzer replaced with SHARP 53 on 16-Jan. Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 88 of 94

89 Histogram of Hourly PM₂.₅ Readings - Station D Percentiles: 1st: µg/m³ 5th: µg/m³ 1th: 1 µg/m³ 25th: 2 µg/m³ 5th: 4 µg/m³ 75th: 8 µg/m³ 9th: 11 µg/m³ 95th: 13 µg/m³ 99th: µg/m³ Number of Hours >8 Concentration (µg/m³) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 89 of 94

90 Timeseries Chart of Hourly Averages for Rel. Humidity - Station D 12 1 Hours Operational: 744 (1.%) Hours of Valid Data: 744 (1.%) No Data Qualifier Flags to Report 8 Humidity (%) Value (N=744) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 9 of 94

91 15 1 Timeseries Chart of Hourly Averages for Ext. Temp. - Station D Hours Operational: 744 (1.%) Hours of Valid Data: 744 (1.%) No Data Qualifier Flags to Report 5 Temperature ( C) Value (N=744) Sample January 219 Monthly Ambient Air Quality Monitoring Report Page 91 of 94