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ABSTRACT

Seasonal and Weekly Pattern of Ozone over the OTAG Region Rudolf B. Husar CAPITA, Center for Air Pollution Impact and Trend Analysis Washington University St. Louis, Missouri. ABSTRACT.

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ABSTRACT

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  1. Seasonal and Weekly Pattern of Ozone over the OTAG RegionRudolf B. HusarCAPITA, Center for Air Pollution Impact and Trend AnalysisWashington UniversitySt. Louis, Missouri

  2. ABSTRACT Human activities follow a pronounced weekly and seasonal cycle which results in cyclic emissions of man-made ozone precursors. The results of this work confirm that April-September is the proper time window for the ozone season. About 95% of the OTAG-wide exceedances occur during this warm part of the year. This holds for both the 120 ppb and the proposed 80 ppb standard. The weekly emission cycle results in a weekly ozone cycle. Over the entire OTAG region, the 90th percentile ozone is reduced from 87 to 81 ppb from Friday to Sunday. The daily exceedances (>120 ppb) are reduced on Sundays to one third of the exceedances on Fridays. This analysis indicates that if the OTAG-wide weekday emissions would be reduced to the current weekend levels, then ozone exceedances would decline by at least factor of three.

  3. Seasonal average ozone concentration over the OTAG region

  4. Difference between July and January ozone concentrations

  5. Seasonality of ozone over the OTAG region

  6. Relative yearly exceedances, 1986-95

  7. Relative seasonality of exceedances at 80, 100 and 120 ppb threshold

  8. Fraction of exceedances in the April-October ozone season

  9. Typical Ozone Seasonality at Tropospheric Background, Regional and Urban Sites

  10. Average ozone concentration over the OTAG region. a) Mondays b) Tuesdays c) Wednesdays d) Thursdays e) Fridays f) Saturdays g) Sundays h) Difference between Fridays and Sundays

  11. Average ozone exceedances per year over the OTAG region. a) Mondays b) Tuesdays c) Wednesdays d) Thursdays e) Fridays f) Saturdays g) Sundays h) Difference between Fridays and Sundays

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