Eighty years ago, the enchantment ended. Los Angeles, that magical realm of shimmering natural beauty, was befouled by smog — maybe forever. The mayor, Fletcher Bowron, told Angelenos in 1944 to lower ...

SMOG checks or emission tests exist due to the U.S. Environmental Protection Agency's (EPA) regulation on passenger vehicles. Each state sets limits of nitrogen oxides (NOx) from emitting past certain ...

Research shows that high temperatures can worsen air pollution, increase ground-level ozone, trap harmful particles in the ...

The NWS has issued warnings as smog levels spike in the U.S. Southwest this weekend—here’s where air quality is turning unhealthy.

California’s war with car culture may not be over, but enthusiasts just scored one of their biggest victories in years. More ...

Every morning, when you step outside in the garden, you always wonder to see a soft white mist or a thick yellow haze in your garden. But do you ever realise that what you are seeing outside is this ...

This is read by an automated voice. Please report any issues or inconsistencies here. Even if you weren’t around Los Angeles in 1992, you’ve heard of Rodney King, the man whose videotaped beating at ...

The Environmental Protection Agency (EPA) signaled late Thursday that it will retain an Obama-era rule on ground-level ozone pollution despite calls from environmentalist groups to strengthen it. The ...

From coal-fired cities to industrial river valleys, a smokey fog crept in quietly and left behind chaos: schools shut down, people collapsed in the streets, and entire towns were brought to a ...

A woman in Las Vegas, Nevada, parked her car outside a smog shop. Moments later, once she returned, she found that an ...