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.
