10 Ways Your Bathroom is Making You Sick

Scary but true: chlorine is commonly found in our tap water. During a hot shower, you breathe in chlorine vapors released in the shower's steam. This inhalation puts you at a higher risk for fatigue, asthma, bronchitis, and both bladder and breast cancer. Install a whole-house water filter to reduce exposure to airborne chlorine while you're showering. Or try a filtered showerhead, such as Aquasana's Shower Filtration System ($85; aquasana.com).

Also see How to Install a Water Filter.