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#air pollution #smog #emissions #factory smoke #vehicle exhaust #industrial pollution #haze

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#nitrogen oxides #nox #air pollution #industrial pollution #vehicle exhaust #smog #acid rain

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#car exhaust #fumes #pollution #engine #vehicle exhaust #emissions #exhaust fumes #dangerous fumes #carbon monoxide

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#car exhaust #tailpipe #emissions #fumes #muffler #vehicle exhaust #car smoke

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#vehicle exhaust #traffic pollution #tailpipe emissions #diesel particles #combustion particles #mobile source pollution