PM 10 Nonattainment Areas

this data layer identifies areas in the u s where air pollution levels have not met the national ambient air quality standards naaqs for pm 10 and have been designated nonattainment the epa office of air quality planning and standards oaqps has set national ambient air quality standards for six principal pollutants which are called criteria pollutants under provisions of the clean air act which is intended to improve the quality of the air we breathe epa sets limits on how much of a pollutant can be in the air anywhere in the united states this ensures that all americans have the same basic health and environmental protections the law allows individual states to have stronger pollution controls but states are not allowed to have weaker pollution controls than those set for the whole country epa calls these pollutants criteria air pollutants because the agency has regulated them by first developing health based criteria science based guidelines as the basis for setting permissible levels one set of limits primary standard protects health another set of limits secondary standard is intended to prevent environmental and property damage a geographic area that meets or does better than the primary standard is called an attainment area areas that don t meet the primary standard are called nonattainment areas