Sergio Melendez
MobileOBDMotor Home
Clean Truck Check in Los Angeles, CA
66 credentialed testers in Los Angeles.
Testers in Los Angeles
SongUKim
Song Kim
OBDMotor Home
300 Mobile Clean truck check
steven marin
South Bay Auto Center
Taewan Kim
MobileOBDMotor Home
Imperialsmog
Victor Castillo
MobileOBDMotor Home
Walts Truck Repair
Walter Flores
MobileOBDOVIOVI tests are required for 2012 and older engines
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.