What are the ambient air quality standards for PM?
What exactly is particulate matter? Particulate matter (PM) is a complex mixture consisting of varying combinations of dry solid fragments, solid cores with liquid coatings and small droplets of liquid. These tiny particles vary greatly in shape, size and chemical composition, and can be made up of many different materials such as metals, soot, soil and dust. PM may also contain sulfate particles. California has a separate ambient air quality standard for sulfates. PM may be divided into many size fractions, measured in microns (a micron is one-millionth of a meter). ARB regulates two size classes of particles – particles up to 10 microns (PM10) and particles up to 2.5 microns in size (PM2.5). PM2.5 particles are a subset of PM10. PM10 and PM2.5 are each measured and expressed as the amount (in micrograms) of particles contained in a cubic meter of air, expressed as micrograms per cubic meter (g/m3). What are the Sources of Airborne Particulate Matter? Burning fuels, such as gasoline,
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- What are national ambient air quality standards?
