On June 9, 2017, the San Diego Air Pollution Control District (SDAPCD) made a preliminary decision to revise the list of Toxic Air Contaminants (TACs) listed in Rules 1200 (Toxic Air Contaminants - New Source Review) and 1210 (Toxic Air Contaminant Public Health Risks-Public Notification and Risk Reduction). Updates have been proposed to Table I (Toxic Air Contaminants for Which Potential Carcinogenic Impacts Must Be Calculated), Table II (Toxic Air Contaminants for Which Potential Chronic Noncancer Impacts Must Be Calculated), and Table III (Toxic Air Contaminants for Which Potential Acute Noncancer Impacts Must Be Calculated).

The SDAPCD has proposed to add carbonyl sulfide (CAS 463-58-1) to Tables II and III, driven by the California Office of Environmental Health Hazard Assessment (OEHHA) determination that carbonyl sulfide has potential acute and chronic noncancer impacts. Carbonyl sulfide is commonly used as an intermediate in organic compound synthesis.  In addition, other minor corrections have been proposed to Tables I, II, and III.  The full text of the public notice can be found here and proposed table revisions can be located on District's website.