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Air Quality Monitoring - ENV 4101/5105 Elements of Air...

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Air Quality Air Quality Monitoring Monitoring ENV 4101/5105 Elements of Air Pollution 08/06/09 1 Aerosol & Particulate Research Lab http://www.statcan.ca/english/freepub/16-254-X Reading: Chap 7.1 & 7.2
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Air Quality Monitoring Monitoring Considerations Manual vs. automated (real-time, continuous) monitoring Sampling time Federal reference method (FRM) vs. equivalent method (EM) Monitoring of Ambient Air Pollutants SO 2 , NOx, CO, O 3 Hydrocarbons PM 10 , PM 2.5 Source Sampling and Monitoring Sampling train Isokinetic sampling Quality Assurance Programs Quality Assurance Quality Control Air Quality Monitoring Network 08/06/09 2 Aerosol & Particulate Research Lab What’s the use of ambient air quality monitoring data?
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Monitoring Considerations Sampling location: limited number of fixed site monitors whose locations reflect objectives of air quality monitoring program Lower limit of detection (LOD): a sufficient amount of pollutant must be collected, f(sampling rate, duration) Integrated sampling vs. real-time sampling Area sampling vs. personal sampling Collection efficiency of the instrument: Low flow rate for gas-phase contaminants (< 1 L/min) 08/06/09 Aerosol & Particulate Research Lab 3 Examples of criteria for selecting ambient sampling locations? What are the objectives?
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4 Differences in averaging times associated with real-time data 08/06/09 Aerosol & Particulate Research Lab Which duration should you use?
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5 National Ambient Air Quality Standards Pollutant Primary Stds. Averaging Times Secondary Stds. CO 9 ppm (10 mg/m 3 ) 8-hour (1) None 35 ppm (40 mg/m 3 ) 1-hour (1) None Pb 1.5 µg/m 3 Quarterly Ave Same as Primary NO 2 0.053 ppm (100 µg/m 3 ) Annual (Arith. Mean) Same as Primary PM 10 Revoked (2) Annual (2) (Arith. Mean) 150 µg/m 3 24-hour (3) PM 2.5 15.0 µg/m 3 Annual (4) (Arith. Mean) Same as Primary 35 µg/m 3 24-hour (5) O 3 0.08 ppm 8-hour (6) Same as Primary 0.12 ppm 1-hour (7) (Applies only in limited areas) Same as Primary SO 2 0.03 ppm Annual (Arith. Mean) ------- 0.14 ppm 24-hour (1) ------- ------- 3-hour (1) 0.5 ppm (1300 µg/m 3 ) http://www.epa.gov/air/criteria.html 08/06/09 Aerosol & Particulate Research Lab Why different durations?
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Federal Reference Methods for Criteria Pollutants Pollutant Reference Method SO 2 Spectrophotometry (pararosanilne method) NO 2 Gas-phase chemiluminescence CO Nondispersive infrared photometry O 3 Chemiluminescence NMHCs Gas chromatography – FID (flame ionization detection) PM 10 Performance-approved product PM 2.5 Performance-approved product 08/06/09 6 Aerosol & Particulate Research Lab
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SO 2 FRM - Spectrophotometry (pararosanilne method) Air sample
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