title: Ethylene: an urban air pollutant.
mesh_terms: D000397:Air Pollution / Q000032:analysis; D005030:Ethylenes / Q000032:analysis / Q000633:toxicity; D010944:Plants / Q000187:drug effects; D014505:Urban Population; D001335:Vehicle Emissions
chemical_list: D005030:Ethylenes; D001335:Vehicle Emissions