Pollen, dust, and spores are common allergens.
It is claimed that these reduce the level of airborne cat allergen by about 50% .
At night, in bed, we spend on average eight hours in close contact with large amounts of house dust mite allergen.
allergen immunotherapy effective in asthma: a meta-analysis of randomized controlled trials.
allergen avoidance web page by the American Medical Association is another source of information.
allergen declarations on labels?