An astounding 19 pages of chemicals go into making one commonly used brand of air freshener, representing just how poorly regulated and toxic this increasingly popular class of consumer products is.

You've probably seen pictures of people navigating urban cityscapes, their noses and mouths covered by medical masks to safeguard against toxic air quality. You might be surprised to learn that it's actually indoor air quality, permeated by chemical "air fresheners," that is a top concern for public health officials.