Sulfur plants

(1) No person shall cause or permit the acid discharge into the atmosphere of– (a) more than 4.0 pounds of sulfur dioxide per ton of sulfur acid produced (calculated as 100 per cent H2SO4); maximum two-hour average; or (b) more than 0.15 pounds of sulfuric acid mist per ton of sulfur acid produced (calculated as 100 per cent H2SO4), maximum two–hour average, expressed as H2SO4, from facilities that produce sulfuric acid by the contact by elemental alkylation’s acid, hydrogen sulfide, organic sulfides and mercaptans or acid sludge. (2) This Regulation shall not apply to existing sources such as metallurgical plants or other facilities when conversion to sulfuric acid is utilized as a means of controlling emission to the atmosphere of sulfur dioxide or other sulfur compounds.