- Vent your gas stove outside to avoid releasing polycyclic hydrocarbons, created by incomplete combustion, into your home, says Shelly Miller, an air-pollution researcher at the University of Colorado.
- Use minimal carpet and drapery. "Carpets can be a reservoir for all sorts of particles," Miller says.
- Use a HEPA filter on your vacuum to keep captured particles from escaping back into the air.
- Look up cosmetic and cleaning products on the Environmental Working Group's "Skin Deep" database (www.ewg.org), which rates more than 50,000 products on a scale of 0 (safe) to 10 (hazardous). A "data gap" rating lets you know whether the conclusion is based on comprehensive safety data or industry research.