2026-14545: Ambient Air Monitoring Reference and Equivalent Methods; Designation of One New Reference Method and Three New Equivalent Methods; Correction
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On July 15, 2026, the U.S. Environmental Protection Agency (EPA) published a notice designating one new reference method for measuring carbon monoxide (CO), one new equivalent method for measuring particulate matter (PM) 2.5 micrometers ([micro]m) or less (PM<INF>2.5</INF>), one new equivalent method for measuring PM 10[micro]m or less (PM<INF>10</INF>), and one new equivalent method for measuring PM<INF>10-2.5</INF> in ambient air. After publication, the EPA realized that there was an error in the notice; therefore, this action corrects and replaces the July 15, 2026, designation notice.
The agency’s own summary, as published.
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