SUMMARY: Off June 5,1980, EPA listed  !norganic arsenic as a hazardous air  pollutant under section 1.12 of the Clean  Air Act (48 FR 37886).Standards were  qubsequently proposed for inorganic  arsenic emissions from high-arsenic  primary copper smelters, low-arsenic  primary copper smelters, and glass  manufacturing plants on July 20,1983 {48  FR 33112). Additional control measures  for high-arsenic primary, copper smelters  and associated amenic plants were  proposed in a December 16, 1983,  Federal Register notice {48 FR 55880)  and additional control options for glass  manufacturing.plants were proposed in  a March 20,1984, Federal Resister notice  (49 FR 10278). This Federal Register  notice reaffirms the Administrator's.  decision that inorganic arsenic is a  hazardous air pollutant and responds to  comments on and promulgates standards for inorganic arsenic emissions from primary Copper smelters,  glass manufacturing plants, and arsenic plants.  

Six other categories of sources  emitting inorganic arsenic were also  identified and discussed in the July 20,  1903. Federal Register notice: primary  lead smelters, secondary lead smelters,  primary zinc smelters, zinc oxide plants,  cotton gins, and arsenic chemical manufacturing plants. This Federal Register notice responds to comments  on the decision that standards for these sources were not warranted and reaffirms the Administrator's decision  not to regulate these sources.