title: Pollution of the air.
mesh_terms: D000397:Air Pollution; D001991:Bronchitis / Q000209:etiology; D002249:Carbon Monoxide Poisoning / Q000453:epidemiology; D006801:Humans; D008131:London; D008854:Microscopy, Electron; D012905:Smog; D012906:Smoke
chemical_list: D012905:Smog; D012906:Smoke