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2018 Ozone Standard Exceedances in National Parks

Published by National Park Service | Department of the Interior | Metadata Last Checked: January 25, 2026 | Last Modified: 2018-01-01T00:00:00Z
Ozone exceedance data for national parks with on-site monitoring. This data set documents the number of days when the ozone standard was exceeded from April to October, 2018. The National Ambient Air Quality Standard for ozone in 2018 is 70 parts per billion (ppb), daily maximum 8-hour average ozone concentration. An exceedance day occurs on each calendar day when the daily maximum 8-hour average is greater than or equal to 71 ppb. Tabular data are available in an Excel document format.

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