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Estimates of number of new pediatric asthma cases attributable to nitrogen dioxide (NO2) in urban areas in 2019 (a) number of new pediatric asthma cases from different sources of NO2 in 2019 (b) number of new pediatric asthma cases in 330 Chinese cities, and (c) percentage of NO2-attributable pediatric asthma incidence from indoor sources to total NO2-attributable pediatric asthma incidence in 330 Chinese cities. SHS, second hand smoke.
