Relationship of indoor NO/sub 2/ concentrations to use of unvented gas appliances

Measurements were made on NO/sub 2/ concentrations in dwellings in the vicinity of the University of Florida at Gainesville and compared with results from previously reported studies on dwellings in suburban London and suburban and rural New York. Measurements in dwellings with no unvented gas appliances were quite low, averaging 3ppB. When the only unvented gas appliance was the kitchen stove, the kitchen concentrations averaged 55ppB. In two residences a heater was the only unvented gas appliance; NO/sub 2/ concentrations in the room containing the heater was 112ppB, while the kitchen showed the same concentration and the unheated space about half this value. (JGB)