Program Overview
- What is it?
- A new program similar to Smog Check but for heavy-duty vehicles
- Clean Truck Check previously referred to as Heavy-Duty Inspection and Maintenance (HD I/M)
- Who is regulated?
- Diesel and alternative fuel vehicles over 14,000 lbs. GVWR operating in California
- Out-of-state vehicles, public vehicles (federal, state, and local)
- How are they regulated?
- Phase 1 – Started January 2023 with high-emitter screening and testing
- Phase 2 – Starts in mid-2023 with reporting and compliance fee payments
- Phase 3 – Full implementation starts in 2024 with periodic compliance testing
Opacity Testing