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This photo shows the old General Chemical plant at Hensley and Castro streets in Richmond during a vapor leak on May 1, 2001. The current plant owner, Chemtrade, has agreed to pay $135,000 in penalties to a clean air agency for alleged air pollution violations that occurred from 2009 to 2014. (CONTRA COSTA TIMES/ GREGORY URQUIAGA)Sulfur dioxide -- a colorless, pungent gas used to produce fertilizers, explosives and petroleum catalysts -- can have adverse health impacts.
Originally published at Katie Lauer