SMOG CITY Los Angeles, shown here, is one of the smoggiest cities in the United States. That haze of air pollution comes not just from cars, but also from an array of consumer products that emit chemicals into the air.
David Iliff
AUSTIN, Texas — To reduce your impact on air quality, you might expect to trade in your gas-guzzling clunker of a car — but you can also unplug those air fresheners.