1 / 37

A Review of Time Integrated PM2.5 Monitoring Data in the United States

A Review of Time Integrated PM2.5 Monitoring Data in the United States. Kenneth L. Demerjian Atmospheric Sciences Research Center University at Albany – SUNY United Nations Economic Commission for European (UNECE) European Monitoring and Evaluation Program (EMEP)

yeo-diaz
Download Presentation

A Review of Time Integrated PM2.5 Monitoring Data in the United States

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. A Review of Time Integrated PM2.5 Monitoring Data in the United States Kenneth L. Demerjian Atmospheric Sciences Research Center University at Albany – SUNY United Nations Economic Commission for European (UNECE) European Monitoring and Evaluation Program (EMEP) Workshop on Particulate Matter (PM) Measurement and ModelingApril 20-23, 2004 New Orleans, LA

  2. U.S. EPA PM National Ambient Air Quality Standards

  3. Daily Distribution of 24-hr PM2.5 Mass from 17 NYC FRM Monitors

  4. NYC 2002 FRM MonitorsAnnual Distribution of 24-hr PM Mass

  5. PM Speciation Network Samplers STN: 1 in three day operation; three simultaneous filters Nylon – IC, Teflon – XRF, Quartz – OC/EC

  6. MET ONE Spiral Aerosol Speciation Sampler (SASSTM)

  7. STN Monitoring Sites: October 2001 – September 2002

  8. Spatial Distribution of STN/FRM Annual PM2.5 Mass October 2001 – September 2002

  9. STN Annual PM2.5 Mass FRM vs. STN

  10. STN Annual Composition

  11. Spatial Distribution of STN Annual PM2.5_SO4 Mass October 2001 – September 2002

  12. Annual Sulfate Fraction of PM2.5 Mass

  13. Spatial Distribution of STN Annual PM2.5_NO3 Mass October 2001 – September 2002

  14. Annual Nitrate Fraction of PM2.5 Mass

  15. Spatial Distribution of STN Annual PM2.5_NH4 Mass October 2001 – September 2002

  16. Annual Ammonium Fraction of PM2.5 Mass

  17. Spatial Distribution of STN Annual PM2.5_OC*1.4 Mass October 2001 – September 2002

  18. Annual Total Carbon Fraction of PM2.5 Mass

  19. PM2.5 Mass Fraction as Carbon Botanical Garden - Bronx, NY

  20. PM2.5 Mass Fraction as SulfateBotanical Garden - Bronx, NY

  21. PM2.5 Mass Fraction as NitrateBotanical Garden - Bronx, NY

  22. PM2.5 Mass Fraction as CarbonPinnacle State Park - Addison, NY

  23. PM2.5 Mass Fraction as SulfatePinnacle State Park - Addison, NY

  24. PM2.5 Mass Fraction as NitratePinnacle State Park - Addison, NY

  25. PM_EC vs. PM_OC*1.4 Seasonal CorrelationBotanical Garden, Bronx, NY

  26. PM_EC vs. PM_OC*1.4 Seasonal CorrelationPinnacle State Park Addison, NY

  27. Winter PM2.5 OC vs. EC – Queens College

  28. Summer PM2.5 OC vs. EC – Queens College

  29. Time-Integrated Measurements • What have we learned about the PM air quality issues from time-integrated measurements? • Distribution of major PM composition varies regionally • Sulfates greater in the east, nitrates greater in the west • Organics show limited spatial variability • Seasonal variations indicated more nitrates in the winter and more sulfate and organics in the summer

  30. Time-Integrated Measurements • What sort of hypothesis testing is being supported by these measurements? • Provide long term time series of PM2.5 components • Accountability for control strategies and health comes • Fuel sulfur rule • 2007 diesel emission standard • NOx regulation • PM nitrate/sulfate changes with reductions in SO2 • Process related production of PM components

  31. Time-Integrated Measurements • What are the advantages of time-integrated measurements? • Provide long term PM speciation data with modest field technician support and modest overall cost (compared to alternatives) • Centralized laboratory analyses and QA/QC procedures improves data quality

  32. Time-Integrated Measurements • What are the most serious issues by way of representing what is actually in the air? • Carbon blank issues and VOC adsorption • MDL for metals • Time resolution • Loss of volatile PM (nitrates and organics)

  33. Time-Integrated Measurements • Which issues confound our ability to test hypotheses, to explain PM concentrations? • Water and volatility of nitrates and SOA • Are critical variables missing that are needed for the support of hypothesis testing/interpretation of mass and species composition measurements? • MDL for critical trace elements will limit source apportionment applications • EC blanks corrections and MDL will likely limit tracking EC perturbations resulting from diesel emission controls

  34. Time-Integrated Measurements • Are the issues/problems intractable in the near term? • ICP/MS analysis techniques can provide improved MDLs for trace metals (as compared to XRF) • How is confidence in the values created in lieu of standards? • Instrument laboratory and field intercomparisons

  35. Acknowledgments This work was supported in part by • U.S. Environmental Protection Agency (EPA) cooperative agreement # R828060010 • New York State Energy Research and Development Authority (NYSERDA), contract # 4918ERTERES99, • New York State Department of Environmental Conservation (NYS DEC), contract # C004210.

  36. Thanks for your attention.

More Related