From California DMV website http://www.dmv.ca.gov/vr/smogfaq.htm#BM2535
"Currently, smog inspections are required for all vehicles except diesel powered vehicles manufactured prior to 1998 or with a Gross Vehicle Weight (GVWR) of more than 14,000 lbs, electric, natural gas powered vehicles over 14,000 lbs, hybrids, motorcycles, trailers, or gasoline powered vehicles 1975 and older."
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