Clearing The Air: The War On Smog
american experience

Fri, Apr 24 7:00 P.M. NH World (11.3)  

In the summer of 1943, a thick noxious haze of smog enveloped the Los Angeles region. Residents complained of burning eyes and lungs, and some experienced nausea. The physical distress caused by the haze was so bad that many feared it was a Japanese chemical warfare attack. Over the next several years, the problem reached crisis proportions. Farmers began complaining of discolored lettuce, wilted crops, and dying produce. Many suspected emissions from sulfur-emitting factories had caused the foul air, but a chemist at the California Institute of Technology had a different theory. Arie Haagen-Smit determined that the smog was the result of sunlight breaking down incompletely burned gasoline and other hydrocarbons found in car emissions. Meanwhile, across the country, toxicologist Mary Amdur made a disturbing discovery: the combined effects of air pollutants, even when not lethal, she determined, could cause permanent damage to lungs. Both Haagen-Smit and Amdur would suffer reprisals from entrenched industries threatened by their discoveries, but as the 1950s progressed, ordinary citizens became active in the fight to address air pollution across the country until, in 1963, President Lyndon B. Johnson signed into law the Clean Air Act, one of the nation's first environmental laws. War on Smog will tell the story of the epic struggle against airborne toxins that lead to a national reckoning about air quality and the creation of the Clean Air Act.

Duration: 55 minutes and 0 seconds

Episode Number: 3704

All broadcast times for this episode: (show all)

Fri, Apr 24 7:00 P.M. Clearing The Air: The War On Smog     NH World (11.3)

About American Experience:

As television's longest-running, most-watched history series, American Experience brings to life the incredible characters and epic stories that helped form this nation.


Watch American Experience - Clips, Episodes & Previews


Future Broadcast times for "American Experience": (show all)

Sun, Mar 15 10:00 P.M. Fly with Me     NH World (11.3)
Mon, Mar 16 2:00 A.M. Fly with Me     NH World (11.3)
Mon, Mar 16 10:00 A.M. Fly with Me     NH World (11.3)
Fri, Mar 20 9:00 P.M. Fly with Me     NH Explore (11.2)
Sat, Mar 21 1:00 A.M. Fly with Me     NH Explore (11.2)
Wed, Mar 25 1:00 P.M. Fly with Me     NH Explore (11.2)
Thu, Mar 26 3:00 A.M. Fly with Me     NH Explore (11.2)
Tue, Mar 31 9:00 P.M. The Cancer Detectives     NH World (11.3)
Wed, Apr 1 2:00 A.M. The Cancer Detectives     NH World (11.3)
Wed, Apr 1 10:00 A.M. The Cancer Detectives     NH World (11.3)
Sat, Apr 4 5:00 A.M. The Cancer Detectives     NH World (11.3)
Tue, Apr 21 3:00 P.M. Poisoned Ground: The Tragedy at Love Canal     NH World (11.3)
Fri, Apr 24 7:00 P.M. Clearing The Air: The War On Smog     NH World (11.3)


NHPBS Over-the-Air Broadcast

WENH-TV Ch. 11 Durham

WLED-TV Ch. 48 Littleton

WEKW-TV Ch. 18 Keene

W50DP-D Ch. 50 Hanover

W34DQ-D Ch. 34 Pittsburg

Cable and Satellite Channels


NHPBS Five Channels

NHPBS - 11.1

Explore - 11.2

World - 11.3

Create - 11.4

Kids - 11.5

All of our channels and NHK World Japan are streaming LIVE ONLINE and on the PBS App, available on most devices.

Learn More


 

Community Impact

NHPBS NHPBS Passport Passport

American Masters | Sun Ra: Do The Impossible [ASL]
History with David Rubenstein | Harold Holzer
NOVA | Mammal Origins
Black and Jewish America: An Interwoven History | Strange Fruit
Finding Your Roots | Westward Bound
Nature | Freshwater | Parenthood
Austin City Limits | Leon Thomas
Antiques Roadshow | Georgia State Railroad Museum, Hour 3
Secrets of the Dead | The Quest for Camelot
The Puzzle Lady | Episode 1
All Creatures Great and Small | Episode 1: Gathering the Flock
American Experience | Bombshell
From That Small Island: The Story of the Irish | New Worlds
London's New Year's Day Parade | The London Parade 2026
Rome New Year's Day Parade 2026 | Rome New Year's Day Parade 2026
Bookish | Slightly Foxed, Part 1
Happiness | Episode 1
Great Performances | Nutcracker from English National Ballet
Miss Scarlet | Episode 3: The Delivery
POV | Between Goodbyes
Christmas With The Tabernacle Choir | Hope of the Season: Christmas with The Tabernacle Choir
London Parade - A Tribute to 40 Years | London Parade - A Tribute to 40 Years
The St. Olaf Christmas Festival: Our Hope for Years to Come | The St. Olaf Christmas Festival: Our Hope for Years to Come
Prue Leith's Cotswold Kitchen | Charlotte Church
The Nutcracker at the Jacobs School of Music | The Nutcracker at the Jacobs School of Music
The Caverns Sessions | Flatland Cavalry
The Great Escaper | The Great Escaper
The American Revolution | In Order to Be Free (May 1754 - May 1775)
Rick Steves' Europe | London: A Royal Tour
RFDS: Royal Flying Doctor Service | Sieve & Sort