CAIR meaning in Governmental ?

The Clean Air Act is the United States' primary federal air quality law, intended to reduce and control air pollution nationwide. Initially enacted in 1963 and amended many times since, it is one of the United States' first and most influential modern environmental laws.

As with many other major U.S. federal environmental statutes, the Clean Air Act is administered by the U.S. Environmental Protection Agency (EPA), in coordination with state, local, and tribal governments. EPA develops extensive administrative regulations to carry out the law's mandates. The associated regulatory programs are often technical and complex. Among the most important, the NAAQS program sets standards for concentrations of certain pollutants in outdoor air; the NESHAPS program sets standards for emissions of particular hazardous pollutants from specific sources. Other programs create requirements for vehicle fuels, industrial facilities, and other technologies and activities that impact air quality. Newer programs tackle specific problems, including acid rain, ozone layer protection, and climate change.

Although its exact benefits depend on what is counted, the Clean Air Act has substantially reduced air pollution and improved US air quality – benefits which EPA credits with saving trillions of dollars and many thousands of lives each year.