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15 houseplants for improving indoor air quality

By: Julie Knapp on March 1, 2010, 11:50 a.m.
azalea in a pot

Photo: Bill/flickr

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Azalea (Rhododendron simsii)

Bring this beautiful flowering shrub into your home to combat formaldehyde from sources such as plywood or foam insulation. Because azaleas do best in cool areas around 60 to 65 degrees, they’re a good option for improving indoor air in your basement if you can find a bright spot.