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"EPA has promulgated Primary National Ambient Air Quality Standards for the following six pollutants: sulfur oxides, particulate matter, carbon monoxide, ozone, nitrogen dioxide, and lead..." Page 181, Neurotoxicity: Identifying and Controlling Poisons of the Nervous System (A U.S. Government publication.). There was no discussion of sulfur specifically in this publication Sorry I couldn't find more. Hope this helps. Did you get a copy of my "claim story" in a previous post regarding "pesticides"? Rudy West NC [log in to unmask]