Garden
Did you know that houseplants
have the ability to absorb potentially harmful pollutants from
the air?
A study done by NASA
scientists showed that the Gerbera daisy and the chrysanthemum
were rated superior in removing benzene (known to cause some
cancers in humans.
Some varieties of
philodendrons were effective in removing benzene, carbon monoxide
and large quantities of 
formaldehyde.
The green spider plant was also effective in removing carbon
monoxide. The aloe vera plant removed low levels of formaldehyde.
Now, the scientists say that polluted rooms cannot be cleaned up by plants alone, but if you choose your greenery with this in mind, it certainly won't hurt and might end up helping quite a bit.
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