trace chemicals

Thanks largely to the press and some radical environmental groups most people are terrified of chemicals because they can give us cancer. Almost all of these scares are bogus, but one that isn't is a beloved chemical – alcohol. Unlike a diet soda, a glass of alcohol poses a legitimate risk.
PCBs have been detected in the air from kitchen cabinets. Does it matter? Or is what inside the cabinets more dangerous. Answer: Neither.