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Competing Interests: The authors declare no competing interests.

Gas and propane stoves emit nitrogen dioxide (NO 2 ) pollution indoors, but the exposures of different U.S. demographic groups are unknown. We estimate NO 2 exposure and health consequences using emissions and concentration measurements from >100 homes, a room-specific indoor air quality model, epidemiological risk parameters, and statistical sampling of housing characteristics and occupant behavior. Gas and propane stoves increase long-term NO 2 exposure 4.0 parts per billion volume on average across the United States, 75% of the World Health Organization's exposure guideline. This increased exposure likely causes ~50,000 cases of current pediatric asthma from long-term NO 2 exposure alone. Short-term NO 2 exposure from typical gas stove use frequently exceeds both World Health Organization and U.S. Environmental Protection Agency benchmarks. People living in residences <800 ft 2 in size incur four times more long-term NO 2 exposure than people in residences >3000 ft 2 in size; American Indian/Alaska Native and Black and Hispanic/Latino households incur 60 and 20% more NO 2 exposure, respectively, than the national average.