Washington (H24N). Chemicals from computer video monitors may be responsible for allergic reactions and headaches, according to a Swedish study published in Environmental Science and Technology, a journal published by the American Chemical Society.

The culprit, according to Conny Ostman, leady author of the study is the chemical triphenyl phosphate. The chemical compound is used as a flame retardant in plastic video monitors and other products.

Previous studies have found triphenyl phosphate to cause allergic reactions in some people. Symptoms have ranged from itching and nasal congestion to headaches.

"We have focused our interest on this compound since it has been proven to be a contact allergen to man and due to the fact that a number of workers in Sweden have acquired health problems related to computer work," Ostman said in a news release concerning the study.

Ostman, who is from the University of Stockholm, said the computer monitor emits the chemical as it heats during its normal, daily use. It is unknown how much exposure can cause a reaction, according to the researchers. But they do know newer computers are emitting more of the chemical than older models.

Ostman suggests that even in offices with adequate ventilation, workers have the potential for allergic reactions to the compound.

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