Clean Air Act

Table of Contents

Introduction References & Edit History Quick Facts & Related Topics

Images & Videos

How is air quality measured?

Read Next

Statue eroded by acid rain, pollution, weathering.

What Happened to Acid Rain?

Community service - volunteers picking up garbage in a park during a spring cleanup. Environmentalism

A Timeline of Environmental History

Close up of a hand placing a ballot in a ballot box. Election vote voter voting

Have Any U.S. Presidents Decided Not to Run For a Second Term?

Washington, D.C. locator map.

What State Is Washington, D.C. In?

Aerial view of Tokyo, Japan at dusk circa 2009. Tokyo Tower (right) located in Shiba Park, Minato, Tokyo, Japan. Office buildings, architecture, skyscrapers, skyline.

Is Light Pollution Really Pollution?

Discover

Dancers at a Cinco de Mayo festival at the Mission District, San Francisco, California. (Photo dated 2019.) holidays

Is Cinco de Mayo Mexico's Independence Day?

Salem Witch Trials. Photogravure after the painting by Walter McEwen titled - The Witches - circa 1890s.

How Rye Bread May Have Caused the Salem Witch Trials

Lake Mead (the impounded Colorado River) at the Hoover Dam. The light-coloured band of rock above the shoreline shows the decrease in water level in the first few years of the 21st century.

6 Lakes That Are Drying Up

airplane in flight (plane, aircraft, flying)

7 Puzzling Plane Disappearances

New York NY/ USA- November 23, 2018 Hordes of shoppers throng the Macy's Herald Square flagship store in New York looking for bargains on the day after Thanksgiving, Black Friday.

Why Is It Called Black Friday?

Scolex (head) of the tapeworm Taenia solium. The hooks of the scolex enable the tapeworm to attach to the intestinal wall.

Uninvited Guests: The 7 Worst Parasitic Worms

An ancient egyptian hieroglyphic painted carving showing the falcon headed god Horus seated on a throne and holding a golden fly whisk. Before him are the Pharoah Seti and the goddess Isis. Interior wall of the temple to Osiris at Abydos, Egypt.

11 Egyptian Gods and Goddesses

Clean Air Act: Facts & Related Content

Written and fact-checked by The Information Architects of Encyclopaedia Britannica

Last Updated: Jun 11, 2025

News •

Trump EPA moves to repeal climate rules that limit greenhouse gas emissions from US power plants • June 11, 2025, 7:18 PM ET (AP)

Trump EPA rollbacks would weaken rules projected to save billions of dollars and thousands of lives • June 5, 2025, 7:03 PM ET (AP)

Takeaways from AP examination showing benefits, costs of rules Trump EPA wants to change • June 5, 2025, 9:05 AM ET (AP)

Senate will try to block California vehicle standards that would phase out gas-powered cars • May 20, 2025, 6:27 PM ET (AP)

Facts

Also Known As	CAA
Date	1970
Location	United States
Context	Montreal Protocol • environmental economics

Photos and Videos

How is air quality measured?

See All Videos and Images →

Topics

public health air pollution acid rain ozone depletion lead emissions trading pollution Environmental Protection Agency nitrogen dioxide chlorofluorocarbon Patient Protection and Affordable Care Act USA PATRIOT Act No Child Left Behind Chinese Exclusion Act Racketeer Influenced and Corrupt Organizations Act American Recovery and Reinvestment Act Americans with Disabilities Act Brady Law Defense of Marriage Act G.I. Bill