Clean Truck Check in Ontario, CA

Trucking activity in San Bernardino 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

1,953

Trucking employees

21,519

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 Ontario. Useful for routing a service stop around your CTC test.

• TA
  4265 East Guasti Road, Ontario, 91761
  TA · HGV: yes · ~5 mi
  View on OpenStreetMap →
• Petro Stopping Centers
  4325 East Guasti Road, Ontario, 91761
  Petro · HGV: yes · ~5 mi
  View on OpenStreetMap →
• Flying J Travel Center
  Flying J · HGV: yes · ~8 mi
  View on OpenStreetMap →
• Flying J
  Flying J · HGV: yes · ~8 mi
  View on OpenStreetMap →
• Flying J Travel Center
  Flying J · HGV: yes · ~9 mi
  View on OpenStreetMap →
• Pilot Travel Center
  2325 Sierra Lakes Parkway
  Pilot · HGV: yes · ~14 mi
  View on OpenStreetMap →
• Pilot Travel Center
  Pilot · HGV: yes · ~21 mi
  View on OpenStreetMap →

+6 more within 25 miles.

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

Air quality context in and around Ontario

Annual aggregate readings from EPA Air Quality System monitors within about 25 miles of Ontario, 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

11.68 Micrograms/cubic meter (LC)

8 monitors · 82,984 observations · 557 days above standard

Nitrogen dioxide (NO₂)

19.46 Parts per billion

14 monitors · 254,430 observations · 0 days above standard

Ozone (O₃)

0.05 Parts per million

13 monitors · 410,026 observations · 1096 days above standard

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