So the rising share of air pollution caused by things like pesticides and hair products is partly an effect of cars getting cleaner. Forty percent of the chemicals added to consumer products wind up in the air, the researchers found. Roughly half of the V.O.C.s in Los Angeles air could be attributed to consumer products, the authors found. California has regulated emissions from consumer products since the late 1980s, and federal regulations have followed suit, setting V.O.C. * Required field You agree to receive occasional updates and special offers for The New York Times products and services.

Source: New York Times February 16, 2018 10:01 UTC