An estimated 101 million Americans lived in the 125 counties in 26 states with failing grades (F) for unhealthy levels of ozone air pollution in the years 2020, 2021, and 2022. Many vulnerable Americans are exposed to unhealthy levels of ozone, which increases the risk of harm to their health
Number of Americans at risk of unhealthy concentrations of ozone in the United States between 2020 and 2022, by grade
(in millions)
Characteristic
Population in millions
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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 20209, 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 2019, 2020 and 2021, 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.
Grades are assigned based on the weighted averages as follows: A=0.0, B=0.3-0.9, C=1.0-2.0, D=2.1-3.2, F=3.3+.
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American Lung Association. (April 16, 2024). Number of Americans at risk of unhealthy concentrations of ozone in the United States between 2020 and 2022, by grade (in millions) [Graph]. In Statista. Retrieved July 22, 2024, from https://www.statista.com/statistics/1358123/population-risk-of-unhealthy-ozone-levels-us/
American Lung Association. "Number of Americans at risk of unhealthy concentrations of ozone in the United States between 2020 and 2022, by grade (in millions)." Chart. April 16, 2024. Statista. Accessed July 22, 2024. https://www.statista.com/statistics/1358123/population-risk-of-unhealthy-ozone-levels-us/
American Lung Association. (2024). Number of Americans at risk of unhealthy concentrations of ozone in the United States between 2020 and 2022, by grade (in millions). Statista. Statista Inc.. Accessed: July 22, 2024. https://www.statista.com/statistics/1358123/population-risk-of-unhealthy-ozone-levels-us/
American Lung Association. "Number of Americans at Risk of Unhealthy Concentrations of Ozone in The United States between 2020 and 2022, by Grade (in Millions)." Statista, Statista Inc., 16 Apr 2024, https://www.statista.com/statistics/1358123/population-risk-of-unhealthy-ozone-levels-us/
American Lung Association, Number of Americans at risk of unhealthy concentrations of ozone in the United States between 2020 and 2022, by grade (in millions) Statista, https://www.statista.com/statistics/1358123/population-risk-of-unhealthy-ozone-levels-us/ (last visited July 22, 2024)
Number of Americans at risk of unhealthy concentrations of ozone in the United States between 2020 and 2022, by grade (in millions) [Graph], American Lung Association, April 16, 2024. [Online]. Available: https://www.statista.com/statistics/1358123/population-risk-of-unhealthy-ozone-levels-us/
