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Smog covering Santiago, Chile with the sun high in the sky
Image: Matias Basualdo/Zuma/picture alliance Image: Matias Basualdo/Zuma/picture alliance

Smog

Technically, it's volatile organic compounds and nitrogen oxides in the presence of sunlight. Practically, it's dirty air caused by emissions from vehicles, agriculture and industry. And smog is making us sick.

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