(upbeat music) For millions of Americans, regular emissions tests, sometimes called smog tests, are just another part of vehicle ownership. 31 states and the District of Columbia have at least one ...

Smog was pervasive in mid-century Los Angeles—so it’s no wonder that this real-life threat made it into Hollywood films. We spoke with authors Robin Murray and Joseph Heumann about the smog-filled ...

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CNN's Mari Ramos explains Beijing's hazardous smog is caused by more than just pollution. 1:58 • Source: CNN Stories worth watching 31 videos Crime & Justice Immigration Education Transportation Race ...

If you lived your entire life on NASA’s International Space Station, watching the earth like some sort of space-age Rapunzel, you’d probably imagine that life on the blue planet looks a little like ...

New Delhi: A video of dense haze engulfing Noida’s high-rise buildings has gone viral, fuelling an online debate over whether the near-zero visibility was caused by winter fog or toxic smog. The ...

Heavy smog envelops the buildings at Beijing's central business district (CBD), Jan. 3, 2017. The scene turns from clear to murky in just 12 seconds, as Beijing’s skyline becomes obscured by what ...