Hazards of the toxic

thank my friend's message. When a division of NBC moved to a newly renovated office in NEW YORK CITY, everyone started to complain of headaches and dizziness. The symptoms disappeared when the employees went home,but in the office ,productivity suffered so much that the division eventually had to be transferred to another building. This is one of the severest examples to date of an international problem that is increasingly agggravated by close vents, hermetically sealed windows and other energysaving measures."indoor air pollution may be a significant public heaalth haaazard,"Even a building's design can promote pollution. If there is a baaseparking garage, carbon monoxide seeps up stairways and elevator shafts. in many buildings the airinlet vents are located opposite the exhaust vents and can't avoid pulling in contaminated air.wish my friend all best. -----zhenghong---from china