An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

RadNet

How often are RadNet’s near-real-time air monitoring data updated on the EPA website?

RadNet near-real-time air data are refreshed hourly during business hours, Monday through Friday. This hourly refresh ensures that the most up-to-date data are available for the last 24 hours.

NOTE: All results are shown in Coordinated Universal Time (UTC).

To learn more, visit RadNet.

Return to Frequent Questions About RadNet.