Clean Truck Check Credentialed Tester

Clean Truck Check in Los Angeles, CA

60 credentialed testers in Los Angeles.

Testers in Los Angeles

Nearby truck stops

OpenStreetMap-tagged truck stops, services areas, and HGV-marked fuel stations within 25 miles of Los Angeles. Useful for routing a service stop around your CTC test.

+4 unnamed stops also in range.

Source: © OpenStreetMap contributors. Last updated 2026-05-18.

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.