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Frequent Questions

Why is an ozone map not available?

The first ozone map of the day is usually available by 9:00 a.m. EST during "ozone season." The typical ozone season is May to September. Many areas stop providing data for maps after September 30 and begin again on May 1.

Sometimes maps are not available because of data collection and transmission problems. When these problems occur, we correct them as soon as possible.

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