title: Ontario launches controversial smog trading program.
authors.forename: Janet
authors.initials: J
authors.lastname: Pelley
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000331:legislation & jurisprudence* / Q000517:prevention & control*; D003132:Commerce; D007221:Industry; D009589:Nitrogen Oxides / Q000032:analysis; D009864:Ontario; D011640:Public Policy; D012016:Reference Values; D012905:Smog; D013458:Sulfur Dioxide / Q000032:analysis; D014481:United States
chemical_list: D000393:Air Pollutants; D009589:Nitrogen Oxides; D012905:Smog; D013458:Sulfur Dioxide