California Emissions Test & Smog Check Stations
Find STAR Certified Emissions Testing Locations Across California
Browse by County
California's emissions testing program operates in all major counties. Select your county below to find certified smog check stations, test-only centers, and STAR certified facilities in your area.
Los Angeles County
Los Angeles, South Gate, Bell, and more
San Diego County
San Diego, National City, La Jolla, and more
Orange County
Fullerton, Orange, Santa Ana, Costa Mesa, and more
Sacramento County
Sacramento and surrounding areas
Alameda County
Oakland, Berkeley, Fremont, and more
San Bernardino County
San Bernardino, Loma Linda, and more
Riverside County
Riverside and surrounding areas
San Joaquin County
Stockton, Lodi, Tracy, and more
Fresno County
Fresno and surrounding areas
Contra Costa County
Walnut Creek and surrounding areas
California's Emissions Testing Requirements
California enforces comprehensive vehicle emissions testing across most counties, particularly in areas with air quality concerns. Understanding the state's requirements helps ensure compliance and avoid registration delays.
Which California Counties Require Emissions Testing?
Enhanced smog check areas include the greater Los Angeles basin, San Diego, Sacramento Valley, and the San Francisco Bay Area. Most urban and suburban counties require regular emissions testing, while some rural counties may have exemptions. Check with your county's specific requirements using our directory above.
STAR Certification Requirements
California's STAR Program requires certain vehicles to be tested at STAR certified stations only. These include vehicles directed by the DMV, gross polluters, and vehicles requiring change of ownership smog checks in designated zip codes. Our directory clearly identifies STAR certified locations in each county.
Get Emissions Test Quotes in Your County
Connect with certified stations in your area