The quality of indoor air is the biggest health issue faced by American workers, according to a survey by the American Industrial Hygiene Association.

More than 40 percent of AIHA members surveyed named indoor air quality the first or second most important health issue for workers. Poor indoor air can be caused by many culprits, such as mold-filled ductwork or formaldehyde-treated carpet, and building evacuations occasionally make news headlines.

Workplace reproductive hazards, environmental lead, and ergonomics were other health issues of concern to AIHA members.