The New Science of Smog

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Liberals are claiming that the Trump Administration’s plans to roll back the Obama fuel-mileage rules will increase pollution. Perhaps they should read up on the latest scientific evidence about the sources of air pollution.

A recent study in the journal Science traced and measured volatile organic compounds (VOCs) in Los Angeles. In the presence of sunlight, these compounds react with NOx to form ozone and smog. Car exhaust was once a greater relative contributor of VOCs and NOx, but engines are now much cleaner.



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