EPA Regional Programs


Apr. 20, 2010
Ozone Season Began April 1
As the weather warms, exposure to unhealthy ground-level ozone conditions becomes more likely and especially harmful to asthmatics and those with respiratory conditions. Volatile organic compounds (VOCs) and Nitrous Oxides (NOx) react with hot temperatures in the air to form ground-level ozone. To alert and protect the public, EPA's AIRNow website provides information about air quality conditions to prevent dangerous over-exposure to ozone pollution.

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Last Updated: July 16, 2014