When did outdoor air pollution first become a significant problem?

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asked Jul 21, 2018 167k views

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Nishantkyal · Answer 1 · 2018-07-28T16:14:36+0000

out door air pollution has been a problem since ancient Romans...but the industrial revouloution was when outdoor air pollution increased and it a significant problem...
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When did outdoor air pollution first become a significant problem?

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