Outdoor air pollution and asthma.
D000393:Air Pollutants / Q000009:adverse effects*; D001249:Asthma / Q000139:chemically induced* / Q000453:epidemiology; D006801:Humans; D006113:United Kingdom / Q000453:epidemiology; D014481:United States / Q000453:epidemiology
D000393:Air Pollutants