title: Tighter ozone standard urged by scientists.
authors: M
authors: M
authors: Sun
mesh_terms: D000393:Air Pollutants / Q000633:toxicity*; D006801:Humans; D010126:Ozone / Q000633:toxicity*; D014481:United States; D014484:United States Environmental Protection Agency
chemical_list: D000393:Air Pollutants; D010126:Ozone