Air toxic hot spot expansion to include diesel engines

By CMTA Staff

Capitol Update, Nov. 2, 2006 Share this on FacebookTweet thisEmail this to a friend

The California Air Resources Board (CARB) is proposing changes to its Emission Inventory Criteria and Guidelines Regulation (a result of AB 2588, 1987, Lloyd Connelly, D-Sacramento) to incorporate emissions from diesel engines into the Air Toxics Hot Spots program.  If you use stationery or portable diesel engines for emergencies, these changes will likely affect you.
You may recall that CARB listed diesel exhaust particulates as a Toxic Air Contaminant in 1998 and assigned it the fourth highest cancer potency factor on the state’s list.

Currently, a facility with diesel engine(s) and less than 10 tons per year of criteria pollutant emissions is exempt from the Hot Spots program requirements, if they use less than 3,000 gallons of diesel fuel per year.  CARB wants to require any facility that operates diesel engines for a total of 20 hours per year or more to comply with the program requirements.
For many facilities, this change will require emission inventory and health risk assessment updates, which in turn could trigger local air district requirements to notify the public and in some cases prepare risk reduction plans.
The draft regulation is scheduled for adoption at the November 16 CARB Board hearing.  CMTA is lobbying CARB on this issue and we encourage individual companies to send letters explaining how this change will impact your operations.  The deadline for letters to be evaluated for final staff recommendations is November 10.  For information on how to submit comments to CARB, go to or contact the Clerk of the Board at (916) 322-5594. 

For additional details, contact Mike Rogge with CMTA at or (916) 498-3313.


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