Transport Refrigeration Units (TRU) powered by diesel internal combustion engines have a potential for health risks to those that live and work nearby. Since diesel particulate matter (DPM) pollutant emissions have been identified as a toxic air contaminant, CARB adopted an Airborne Toxic Control Measure (ATCM) for TRUs on February 26, 2004, with amendments in 2010 and 2011.

The following are a number of important things TRU operators in California should be aware of:
ATCM Information & Resources
You can find more about the Airborne Toxic Control Measure (ATCM) rulemaking at:
New TRU Regulation in Development
The State of California has recently placed additional emphasis on protecting local communities from the harmful effects of air pollution through the passage of Assembly Bill (AB) 617 (C. Garcia, Chapter 136, Statutes of 2017). AB 617 is a significant piece of air quality legislation that highlights the need for further emission reductions in communities with high exposure burdens. The new regulatory efforts go beyond the existing TRU ATCM to achieve greater emission reductions needed to minimize community exposure to air pollution, as well as meet air quality and climate mitigation goals. It is designed to reduce criteria pollutants, toxic air contaminants, greenhouse gas emissions, as well as community and regional air pollution.
Draft Regulatory Language
The new TRU Regulation addresses the increase in <25 horsepower units, includes refrigerant requirements, and suggests a transition to zero-emission technology, as well as increase the installation of electric fueling and charging infrastructure that will be needed for those technologies.
Read the Full Proposed Regulation Here
Meetings & Workshops
CARB has invited the public to participate in public workshops to discuss their updated concept for the new TRU Regulation. The workshops are open to the public and CARB staff encourages participation and attendance by all parties.
Upcoming workshops/webinars:
3/19/20 9:30am-12:30pm (PDT)
New TRU Regulation Updated Concept Webinar - Sacramento, CA
3/24/20 1:00pm-4:00pm (PDT)
New TRU Regulation Updated Concept Workshop - Fresno, CA
Workshop Notices
More information and info about past events
Current Compliance Information
The public may use the Public TRU Search to search CARB’s Equipment Registration (ARBER) system to check the compliance status of TRUs and TRU generator sets.  Report noncompliant TRUs to CARB's Complaint Hotline.
Rypos Inc. DPF

(508) 429-4552

40 Kenwood Circle, Franklin, MA 02038

  • DPF LinkeIn
  • Diesel Particulate Filter
  • Diesel Particulate Filter
  • Diesel Particulate Filter