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Criteria for an ozone conducive day are: temperatures greater than 85 degrees Farenheit; wind speeds less than 10 miles per hour; solar radiation of 500 Langleys or better (Langley is a measurement unit); little or
no daytime precipitation; and winds from southeast to west.
The second chart shows the number of exceedances of the one-hour ozone standard from 1984-2001 and the start dates for transportation-related control strategies in the Missouri portion of the St. Louis region.
These strategies include the vehicle emissions inspection and maintenance (I/M) program, vapor recovery at service stations and clean fuels program (low volatility gasoline and Reformulated Gasoline program).
This chart is based on information from the Missouri Department of Natural Resources.
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