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mars1129 [50]
3 years ago
12

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

Health
2 answers:
agasfer [191]3 years ago
7 0
The right answer is carbon dioxide
Grace [21]3 years ago
4 0
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. 
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