The Caterpillar Diesel Particulate Filter System for off-highway machines has earned Level 3 Plus verification from the California Environmental Protection Agency Air Resources Board. The verification formally recognizes the Caterpillar passive filter system as effective and reliable in achieving at least an 85 percent reduction in particulate matter exhaust emissions. The system also meets the California 2009 regulation governing nitrogen dioxide emissions.
The verification governs wheeled machines in the 175- to 300-horsepower range, but Caterpillar expects it to be extended to tracked machines and the horsepower range extended as more field-test data is considered. Effectively, the verification allows owners of Caterpillar machines meeting Tier 1, 2 or 3 with a maximum 0.2 grams per horsepower-hour to retrofit with the filters and comply with California rules governing in-use, off-road heavy-duty diesel vehicles.