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Analysis of VOC to NOx Ratios in the South Coast Air Basin

California Environmental Protection Agency. Air Resources Board. Analysis of VOC to NOx Ratios in the South Coast Air Basin. Eileen McCauley Research Division . Methodology. TNMOC from PAMS used for VOC concentration 3 hour canister samples C2 - C10 hydrocarbons

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Analysis of VOC to NOx Ratios in the South Coast Air Basin

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  1. California Environmental Protection Agency Air Resources Board Analysis of VOC to NOx Ratios in the South Coast Air Basin Eileen McCauley Research Division

  2. Methodology • TNMOC from PAMS used for VOC concentration • 3 hour canister samples • C2 - C10 hydrocarbons • NOx concentrations are averages of 3 one hour average

  3. Azusa

  4. Banning

  5. Burbank

  6. Hawthorne

  7. LA North Main

  8. Upland

  9. Azusa Average VOC/NOx

  10. Banning Average VOC/NOx

  11. Burbank Average VOC/NOx

  12. Hawthorne Average VOC/NOx

  13. LA North Main Average VOC/NOx

  14. Upland Average VOC/NOx

  15. Percent Weekend Increase

  16. THC vs PAMS Both the 8202 and Beckman THC instruments observed approx. 10 - 20% weekend decrease. Is there a change in VOC inventory on the weekend?

  17. Recommendations: • Calculate VOC/NOx ratios with carbonyls data and/or correction to total • 18 months of hourly total VOC measurements at several sites in SOCAB • Investigate possible differences in weekday / weekend data of THC and PAMS

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