Don't get snookered by the "natural" claim. In a study carried out by the Natural Resources Defense Council, 14 different household air fresheners were tested. Remarkably nearly all products, even those advertised as 'all natural' or 'unscented' contained dangerous chemicals that are associated with hormone disruption and reproductive problems.
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http://au.ibtimes.com/articles/251760/20111118/study-exposure-common-air-fresheners-cause-allergies.htm