2134 Market St
Concord, CA 94520
(925) 687-7664
Coupon by: SmogCheckDeals.com
This shop's smog licence isn't current with the state. Confirm with the shop before you rely on this listing.
Price
Call for price
Hours
Open Mon–Sat
Station type
Test Only
Appointments
Walk-ins welcome
Hours
- Monday
- 9 AM – 7 PM
- Tuesday
- 9 AM – 7 PM
- Wednesday
- 9 AM – 7 PM
- Thursday
- 9 AM – 7 PM
- Friday
- 9 AM – 7 PM
- Saturday
- 9 AM – 7 PM
- Sunday
- Closed
Good to know
Languages
English
Payment
Credit Card, Debit Card, NFC/Contactless
What to expect at Green Star Smog
Green Star Smog is licensed by the Bureau of Automotive Repair as a Test Only smog station in Concord. It runs the inspection and issues the certificate but does no repairs. Its STAR certification is currently suspended in the BAR registry, so it cannot test DMV-directed vehicles until that is restored.
Walk-ins are welcome. Most smog checks take 15 to 30 minutes, and most visits are closer to 20.
What to bring
Your registration or DMV renewal notice
It says whether the car needs a STAR station.
The car, with the check engine light off
On a 2000-or-newer car, a lit check engine light fails the test on its own.
A way to pay
The $8.25 state certificate is paid on top of the test when the car passes, unless the station's price or coupon includes it.
What if I fail?
- Green Star Smog doesn't do repairs, so the car goes to a repair shop and comes back for the retest.
- Each station sets its own retest price, so ask before the first test.
- BAR's Consumer Assistance Program pays up to $1,450 toward emissions repairs for income-eligible owners.
2134 Market St, Concord, CA 94520
Get directions →Hours
- Monday
- 9 AM – 7 PM
- Tuesday
- 9 AM – 7 PM
- Wednesday
- 9 AM – 7 PM
- Thursday
- 9 AM – 7 PM
- Friday
- 9 AM – 7 PM
- Saturday
- 9 AM – 7 PM
- Sunday
- Closed
Also listed on
Questions about Green Star Smog
Green Star Smog is open Monday 9 AM to 7 PM; Tuesday 9 AM to 7 PM; Wednesday 9 AM to 7 PM; Thursday 9 AM to 7 PM; Friday 9 AM to 7 PM; Saturday 9 AM to 7 PM. Closed Sunday. Hours can change on holidays, so call ahead if you are cutting it close.
Green Star Smog accepts Credit Card, Debit Card, NFC/Contactless.
Google lists the following accessibility features at Green Star Smog: wheelchair accessible entrance, wheelchair accessible parking.
Green Star Smog has held a BAR smog license since 2018. You can verify the license status at bar.ca.gov.
Green Star Smog has not published a price on SmogCheckDeals. The Bureau of Automotive Repair puts the statewide average at $69.16 as of August 2026, about $65 for a 2000-or-newer vehicle and $73 for 1999-or-older, plus the $8.25 certificate fee. Call (925) 687-7664 for a quote.
Green Star Smog does not take online bookings here, but walk-ins are welcome. Call (925) 687-7664 to check the wait.
Staff at Green Star Smog speak English.
How we get this data: BAR licenses and STAR status, Google hours and ratings, coupons published by the station.
Verify this station’s license and STAR standing at bar.ca.gov.
BAR field office: Hercules • Licensed since 2018