It can also impair visibility and reduce crop production, as well as damage ecosystems, national parks, wilderness areas, and water bodies.
Air pollution comes from many different sources.
The Clean Air Act provides the principal framework for national, State, Tribal, and local efforts to protect air quality. Reducing emissions of sulfur dioxide and nitrogen oxides that cause acid rain. Limiting use of chemicals that damage the stratospheric ozone layer in order to prevent increased levels of harmful ultraviolet radiation. Ensuring that sources of toxic air pollutants are well controlled. The Clean Air Act established two types of National Ambient Air Quality Standards.