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American Experience

Clearing the Air: The War on Smog

Season 37 Episode 4 | 52m 39s

In 1943, dark, smoky clouds enveloped Los Angeles, causing residents to complain of burning eyes, nausea, and difficulty breathing. The source of the smog was a mystery. CLEARING THE AIR: THE WAR ON SMOG is the story of the epic struggle for clean air, involving years of scientific study and civic pressure that would lead to the creation of the EPA and the Clean Air Act. From AMERICAN EXPERIENCE.

Aired: 08/25/25 | Expires: 09/24/25
Corporate sponsorship for American Experience is provided by and . Major funding by the Alfred P. Sloan Foundation.
Extras
Watch • 2:16:40
American Experience
The Presidents: FDR (Part 2)
Part of the award-winning The Presidents collection.
Episode: S7 E2 | 2:16:40
Watch • 1:38
American Experience
Trailer | Hard Hat Riot
Watch a preview of Hard Hat Riot.
Preview: S37 E5 | 1:38
Watch • 4:57
American Experience
The Secret Hollywood Campaign to Clean L.A'.s Air
When smog issue plagued their city in the mid 20th century, Angelenos got creative.
Clip: S37 E4 | 4:57
Watch • 4:58
American Experience
The mystery of L.A.鈥檚 smog revealed
The major breakthrough in understanding L.A.'s deadly smog came from a surprising place.
Clip: S37 E4 | 4:58
Watch • 4:34
American Experience
Smog on the Big Screen from Blade Runner to Godzilla
How has L.A.'s history of smog shown up on the big screen?
Clip: S37 E4 | 4:34
Watch • 8:41
American Experience
Chapter 1 | Clearing the Air: The War on Smog
Watch a preview of Clearing the Air: The War on Smog.
Clip: S37 E4 | 8:41
Watch • 2:22
American Experience
Trailer | Clearing the Air: The War on Smog
Watch a preview of Clearing the Air: The War on Smog.
Preview: S37 E4 | 2:22
Watch • 3:08
American Experience
The Women of Polaroid
The women behind the camera.
Clip: S37 E3 | 3:08
Watch • 1:58
American Experience
Why do people shake Polaroid pictures?
We were told to "shake it like a Polaroid picture". But what if we got it wrong?
Clip: S37 E3 | 1:58
Watch • 5:00
American Experience
The Anatomy of Unrest | What the History?!
WHAT THE HISTORY?!
Clip: S36 E5 | 5:00