The US Environmental Protection Agency has determined that diesel particulates are harmful carcinogens that contribute significantly to poor air quality and cause serious health issues. Through the Clean Air Act, they have regulated the requirement for most diesel engines to reduce their overall emission levels including diesel particulates.

DPFs applied to new and older engines significantly reduce these harmful emissions and allow operators to run their diesel-powered equipment in full compliance with the regulations. 

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The Clean Air Act requires the EPA set National Ambient Air Quality Standards (NAAQS) for pollutants. States are required to develop plans to reach and maintain the NAAQS. 

Beginning with the 2007 model year, 100 percent of the on-road diesel HDEs required the use of a diesel particulate filter and 50 percent of the engines require NOx exhaust control technology; beginning with the 2010 model year, 100 percent of the on-road heavy-duty diesel engines require NOx exhaust control technology. 

CARB has more than 50 regulatory programs impacting stationary and mobile sources. Enforcement is critical for public health benefits. CARB requires trucks and trailers with transport refrigeration units that are 7 or more years old.

You can avoid paying a substantial fine if inspectors stop your vehicle and issue a citation. Violation of the mandate can result in penalties of $5,000 to $10,000 per violation per day.