Clean Air Act: A Summary of the Act and Its Major Requirements [Updated January 19, 2022] [open pdf - 1MB]
From the Summary: "This report summarizes the Clean Air Act and its major regulatory requirements. The principal statute addressing air quality concerns, the Clean Air Act was first enacted in 1955, with major revisions in 1970, 1977, and 1990. The act  requires EPA to set health-based standards for ambient air quality;  sets deadlines for the achievement of those standards by state and local governments;  requires EPA to set national emission standards for large or ubiquitous sources of air pollution, including motor vehicles, power plants, and other industrial sources;  mandates emission controls for sources of 187 hazardous air pollutants;  establishes a cap-and-trade program to limit acid rain;  requires the prevention of significant deterioration of air quality in areas with clean air;  requires a program to restore visibility impaired by regional haze in national parks and wilderness areas; and  implements the Montreal Protocol to phase out most ozone-depleting chemicals. This report describes the act's major provisions and provides tables listing all major amendments, with the year of enactment and Public Law number, and cross-referencing sections of the act with the major U.S. Code sections of the codified statute."
CRS Report for Congress, RL30853
Congressional Research Service: https://crsreports.congress.gov/