2025-17079: Ambient Air Monitoring Reference and Equivalent Methods; Designation of Three New Equivalent Methods and One New Reference Method
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Notice is hereby given that the Environmental Protection Agency (EPA) has designated one new equivalent method for measuring SO<INF>2</INF>, one new reference method for measuring NO<INF>2</INF>, one new equivalent method for measuring concentrations of PM<INF>2.5</INF>, and one new equivalent method for measuring PM<INF>10-2.5</INF> in ambient air.
The agency’s own summary, as published.
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