title: Letter: Potential dilemma: the method of meeting automotive exhaust emission standards of the Clean Air Act of 1970.
mesh_terms: D003517:Cyclopentanes; D004782:Environmental Health; D005742:Gasoline; D007878:Legislation as Topic; D008345:Manganese; D009942:Organometallic Compounds; D014481:United States; D001335:Vehicle Emissions / Q000517:prevention & control*
chemical_list: D003517:Cyclopentanes; D005742:Gasoline; D009942:Organometallic Compounds; D001335:Vehicle Emissions; D008345:Manganese