602471 external_news 1518795615 1519050817 When you walk outside, you might be breathing in more than just car emissions. The good news: car emissions have decreased significantly. The bad news: everyday chemicals now rival cars as a source of air pollution. A new study found that indoor chemical products can, in outdoor air, contribute to ozone or even dangerous small-particulate pollution. School of Earth and Atmospheric Sciences' Sally Ng praised the study: "I think this is a comprehensive study," she said. "[P]revious source apportionment studies have understimated volatile chemical product emissions as sources of urban VOCs."

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