Sources of Ground Ozone
A major cause of the conditions is due to pollutants in the air released by heavy industry (manufacturing plants, refineries, coal-fired power plants). Therefore, Ozone Action Days occur most frequently in the Midwestern United States. In recent years, many sites have taken steps to help reduce the amount of pollutants they discharge.
Secondary sources include automotive emissions (leaky auto exhaust systems, excessive engine idling) and liberal use of household chemicals or sprays. It is believed that nearly fifty percent of pollutant ozone molecules are attributed to the presence of these .
Read more about this topic: Ozone Action Day
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