Ambient Air Monitoring Reference and Equivalent Methods; Designation of One New Reference Method and Three New Equivalent Methods

Official abstract: Notice is hereby given that the U.S. Environmental Protection Agency (EPA) has designated one new reference method for measuring carbon monoxide (CO), one new equivalent method for measuring particulate matter (PM) 2.5 micrometers (µm) or less (PM<INF>2.5</INF>), one new equivalent method for measuring PM 10µm or less (PM<INF>10</INF>), and one new equivalent method for measuring PM<INF>10-2.5</INF> in ambient air.