Most ozone-polluted cities in the United States

Published by Ian Tiseo, Jun 10, 2024

The most ozone-polluted city in the United States between 2020 and 2022 was Los Angeles-Long Beach in California, with an average of 175 days with high ozone. Seven of the 10 most ozone-polluted cities in the U.S. were in California during this period.
Ground-level ozone is formed in the atmosphere when nitrogen oxides (NOx) and volatile organic compounds (VOC) react with each other in sunlight and hot temperatures.

Cities and areas with the highest average days with unhealthy ozone pollution levels in the United States between 2020 and 2022 (in weighted average days)

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Release date

April 2024

Region

United States

Survey time period

2020 to 2022

Supplementary notes

The majority of U.S. counties don’t have monitors — which means that many communities, especially rural ones, don’t have official monitored information on their air quality. Please note that the population figures in this statistic are only for those places that collect air pollution data, and do not reflect the entire population of these groups in the U.S.

The 2020, 2021, and 2022 AQS hourly ozone data were used to calculate the daily 8-hour maximum concentration for each ozone-monitoring site. The highest 8-hour daily maximum concentration in each county for 2020, 2021, and 2022, based on EPA-defined ozone season, was identified. The current National Ambient Air Quality Standard for ozone is 70 parts per billion (ppb) measured over eight hours.

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