The CAA sets primary and secondary standards for major pollutants (§7409).

The CAA requires states to establish air quality control regions and develop SIPs to achieve the nation's ambient air standards within reasonably statutorily defined time periods (§§7404, 7406).

The CAA requires the EPA to establish NSPSs to limit emissions from new or expanding sources to the fullest extent possible (§7411).

The CAA requires the EPA to establish emission standards for hazardous air pollutants (§7412).

The CAA mandates the EPA to follow specific strategies for limiting emissions from stationary sources in both attainment and nonattainment areas (§§7470 et seq., 7501 et seq.).

The CAA mandates the EPA to follow a specific strategy for controlling mobile air emission sources (§7521 et seq.).

The EPA can commence a civil or criminal action for a violation of any requirement of an applicable implementation plan. Additionally, the CAA provides for citizen suits to insure that the EPA is performing all of its nondiscretionary duties (§§7413, 7604).

The CAA amendments of 1990 add substantial content to the act including provisions focusing on urban air pollution, mobile sources, toxic pollutants, permits, and the problems associated with acid rain.

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