state smog two
Bezuayeho Wendwesen
OBD
Clean Truck Check in Los Angeles, CA
66 credentialed testers in Los Angeles.
Testers in Los Angeles
usc smog
Bong Lee
Bryan Gonzalez
MobileOBD
Chris Chappel
MobileOBDMotor Home
C-los Mobile CARB Check
Christian Lopez
MobileOBDMotor Home
Cz express llc
Christian Zamora
MobileOBDOVIOVI tests are required for 2012 and older enginesMotor Home
Simply CTC SoCal LLC
Christopher Lombera Jr.
MobileOBD
Curtis McNeal
MobileOBDOVIOVI tests are required for 2012 and older engines
Julian’s Mobile Service
Daniel Quinteros
OBD
Dan Ortiz
OBD
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.