Particulate Matter (PM-10)

Any liquid or solid particle 10 microns in size, except uncombined water suspended in or falling through the atmosphere. PM-10 includes smoke, soot, dust, sulfates, nitrates, lead, and a variety of organic compounds. National Ambient Air QualityStandards set up by the Environmental Protection Agency to measure the health impacts of air pollution. EPA established standard measures for six pollutants: carbon monoxide, ozone, particulate matter, lead, sulfur dioxide and nitrous oxide. The transportation provisions of the Clean Air Act focus on ozone and carbon monoxide standards. More Standards have been established for particulate matter.