Clean Truck Check Credentialed Tester

Clean Truck Check in Phoenix, AZ

17 credentialed testers in Phoenix.

Testers in Phoenix

Trucking activity in Maricopa 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
1,309
Trucking employees
25,164

Source: FMCSA MCMIS carrier census, US Census County Business Patterns 2021.

Nearby truck stops

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

+11 more within 25 miles.

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

Air quality context in and around Phoenix

Annual aggregate readings from EPA Air Quality System monitors within about 25 miles of Phoenix, 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
8.55 Micrograms/cubic meter (LC)
11 monitors · 280,324 observations · 773 days above standard
Nitrogen dioxide (NO₂)
24.7 Parts per billion
5 monitors · 81,294 observations · 0 days above standard
Ozone (O₃)
0.05 Parts per million
23 monitors · 1,577,789 observations · 241 days above standard

Source: EPA Air Quality System (AQS) API. Reporting year 2025. Last fetched 2026-05-18.