Health and environmental assessment of the consequences of accidental contamination of an area in the Negev desert is described and the effects of exposure to bromine vapor in 6 persons evaluated. They were only mildly affected during the acute spillage of the bromine, with some respiratory symptoms and first and second degree skin burns of small exposed areas on the legs. All were treated in hospital and were released within 1-4 days. 6-8 weeks later they demonstrated a complex array of complaints, including cough, shortness of breath, chest tightness, eye irritation, headache, dizziness, fatigue, memory disturbances, sleep and sexual disturbances. These complaints could not be substantiated by objective clinical or laboratory examination. There was thus obvious magnification of the complaints 1-2 months after the accident.