Air pollution in the urban environment.
D000397:Air Pollution; D002248:Carbon Monoxide / Q000009:adverse effects; D004782:Environmental Health; D006801:Humans; D009589:Nitrogen Oxides / Q000009:adverse effects; D013458:Sulfur Dioxide / Q000009:adverse effects; D014505:Urban Population
D009589:Nitrogen Oxides; D013458:Sulfur Dioxide; D002248:Carbon Monoxide