Kwang Eui Yi
Mobile
Clean Truck Check in Los Angeles, CA
69 credentialed testers in Los Angeles.
Testers in Los Angeles
Croffstar Smog
Larry Croffie
MobileOBDMotor Home
ARCEO TRANSPORT LLC
Luis Arceo
OVIOVI tests are required for 2012 and older engines
SoCal Smog Testing
Marco Martinez
MobileOBDOVIOVI tests are required for 2012 and older enginesMotor Home
ROADMASTERS
Margar Margaryan
MobileOBDOVIOVI tests are required for 2012 and older enginesMotor Home
M.C.M. SMOG TEST ONLY
MARIA MARTINEZ
OBD
Montos Solutions Inc
Mariano Toscano
MobileOBDOVIOVI tests are required for 2012 and older enginesMotor Home
Marquest
Marquest Gatewood
MobileOBDOVIOVI tests are required for 2012 and older enginesMotor Home
Mauri’s CTC
Mauricio Ontiveros
MobileOBDMotor Home
ERENS CARB EMISSION CHECK
Mauricio Sanchez
MobileOBD
Trucking activity in Los Angeles County
Clean Truck Check applies to heavy-duty vehicles that operate in California — including out-of-state trucks based here that run loads west.
Trucking establishments
5,780
Trucking employees
39,203
Source: FMCSA MCMIS carrier census, US Census County Business Patterns 2021.
Air quality context in and around Los Angeles
Annual aggregate readings from EPA Air Quality System monitors within about 25 miles of Los Angeles, reporting year 2025. Clean Truck Check exists to reduce real-world emissions from heavy-duty vehicles — the numbers below are the local baseline those rules are designed to improve.
PM2.5
11.16 Micrograms/cubic meter (LC)
9 monitors · 93,313 observations · 563 days above standard
Nitrogen dioxide (NO₂)
16.43 Parts per billion
15 monitors · 272,544 observations · 0 days above standard
Ozone (O₃)
0.05 Parts per million
13 monitors · 410,017 observations · 382 days above standard
Source: EPA Air Quality System (AQS) API. Reporting year 2025. Last fetched 2026-05-18.