It is not only the cars…

Research shows paints, perfumes, sprays and other synthetic items contribute to high levels of ‘volatile organic compounds’ in air

In roadside air in Los Angeles researchers found that as much PM2.5 and Ozone came from industrial and household products refined from petroleum as from vehicle exhaust pipes.

A rough estimate is that between one quarter and a third of all particles are made up of organic compounds that originate as VOCs

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