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Amendments to introduce more stringent control of hazardous air pollutants and revise the National Ambient Air Quality Standards.

Established measures to prevent deterioration of air quality in areas complying with the NAAQS but where air quality was predicted to worsen without intervention.

Amendments focused on improving air quality through the regulation of emissions of volatile organic compounds (VOCs) and oxides of nitrogen (NOx).

Air Quality Act - Provided for enforcement procedures against polluters, extended research and monitoring, and allowed for the creation of air quality control regions.

Administrative Amendments - Minor changes to improve the efficiency of permits and reduce certain administrative burdens.

Implementation of Tailoring Rule for greenhouse gas (GHG) emissions to phase in permitting requirements and to focus on the largest emitters.

Establishment of National Ambient Air Quality Standards (NAAQS), new requirements for State Implementation Plans (SIPs), and creation of New Source Performance Standards (NSPS) and National Emissions Standards for Hazardous Air Pollutants (NESHAPs).

Air Pollution Control Act - The first federal legislation involving air pollution. Provided funds for federal research in air pollution.

Focus on prevention of significant deterioration (PSD) in air quality in areas with clean air, and protection of visibility in national parks and wilderness areas.

Motor Vehicle Air Pollution Control Act - First statutes to mandate emission standards for cars.

Focused on addressing stationary source pollution and introduced requirements for non-attainment areas failing to meet NAAQS.

Clean Air Act of 1963 - First federal legislation to control air pollution comprehensively. Established a basic research program.

Amendments aimed at reducing inter-state air pollution and improving the 3 P's: Permitting, Pricing, and Preference.

Revisions made to regulate the emissions of chlorofluorocarbons (CFCs) due to their depleting effect on the ozone layer.