On October 12, 2016 the San Diego Air Pollution Control District (SDAPCD) released its annual Air Toxics "Hot Spots" Program Report.  The SDAPCD has analyzed toxic emission inventories submitted by San Diego industrial facilities and has generated an emissions estimate for calendar years 2011 through 2014.  The estimates are based on at least five emissions inventories previously submitted by the majority of facilities in San Diego County.  The report contains emissions estimates for all industrial and non-industrial sources.

The report concludes that motor vehicles, area sources, and natural sources are the key contributors to toxic air contaminants in San Diego County.  It has been estimated, by the California Air Resources Board's 2008 California Toxics Inventory, that these sources annually emit more than 62.8 million pounds of toxic compounds.  Based on recent facility inventories it has been estimated that industrial contributors release approximately 1.5 million pounds of toxic emissions annually.  In addition, the SDAPCD has determined that industrial toxic emissions have been reduced by approximately 0.54 million pounds between 2009 and 2014.  Additional information can be found here in the full report.