The war on smog has been called one of America’s greatest environmental successes. Decades of emissions-cutting regulations under a bipartisan law — the 1970 Clean Air Act — have eased the choking pollution that once shrouded U.S. cities. Cleaner air has saved lives and strengthened the lungs of Los Angeles children.

But now, air quality is slipping once again.

 

Credit: iStock, milehightraveler

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