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High levels of in the atmosphere can cause photochemical smog, which can trigger respiratory problems.

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User Sortas
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2 Answers

2 votes
Photo chemical Smog is a form of air pollution. A main source of air pollution is Carbon Dioxide. Known as Co2, this air comes from cars, burning items, and factories. 
answered
User Andrew Slaughter
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0 votes
the right answer is carbon dioxide
answered
User Zechdc
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8.3k points
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