Ozone from photocopiers and mite allergens  In a poorly ventilated office, ozone from photocopiers can make an allergic reaction to house dust mites worse.  Prolonged exposure to ozone can temporarily change the ‘tone’ of the lungs making them ‘twitchy’ and more responsive to an injury from mite enzymes.  The change in the ‘tone’ of the lungs can build continuously for 6 hours and once established, persist for 24 hours. People with asthma should understand this danger and avoid prolonged exposure to ozone in the workplace. Clin. Exp. Allergy 2003; 33: 777-782 Other Public Research What is the house dust mite How mites can cause and trigger allergic disease  What can be done to reduce the health risks from mite exposure What other ‘events’ make mites more harmful . Ozone from photocopiers and mite allergens  House dust mites can make lung inflammation worse Life in house dust mite droppings Flu and the house dust mite Dog dermatitis is caused by specialized allergens from house dust mites.  All 20 allergens from house dust mites must be taken into account in assessing reactions Skin Testing for Allergies Skin prick testing after 14 years