Postcard from California: Chemical warning labels are everywhere – and they’re working

By Bill Walker

A driver entering an enclosed parking garage in California is greeted by a 20-by-20-inch sign declaring in 72-point type:
WARNING: Breathing the air in this parking garage can expose you to chemicals including carbon monoxide and gasoline or diesel engine exhaust, which are known to the State of California to cause cancer and birth defects or other reproductive harm.

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