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

abstract

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.

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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

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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