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The PM-10 and PM-2.5 Standards

There are presently 21 areas that violate the current PM-10 standard. The standards for PM10 limits PM10 concentrations to 50 µg/m3 based on an annual average, and 150 µg/m3 based on a 24-hour average. The annual PM-2.5 standard (2012) is 12 ug/m3. The level of the 24-hour PM-2.5 standard (2006) is 35 micrograms per cubic meter (µg/m3). Maps of the EPA's PM-10 and PM-2.5 designations for nonattainment can be reviewed by clicking here.

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