A study on this subject appears to shed light on the issue: The problem is likely due to mold allergy. Researchers found that after 2 weeks of being indoors, a live Christmas tree in Connecticut emitted significant amounts of mold spores into the air. In fact, the amount of mold spores found in a home with a Christmas tree was nearly 10 times the amount of mold normally found inside. People who suffer from mold allergies may want to limit the amount of time a Christmas tree is kept indoors (such as less than 2 weeks), or consider using an artificial tree.
Learn more about avoiding holiday allergies.
Source:
Rockwell WJ, Santilli J. MOLD ALLERGY AND LIVE CHRISTMAS TREES. Ann Allergy Asthma Immunol. 2008; 100(s1):P59.
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