Peterbilt is offering the Cummins Westport ISL G Near Zero NOx emissions natural gas engine for its Model 567, 520, and 320 trucks.
Calif. Clean Air Plan Calls for Further NOx, PM Reductions
As part of a broad-reaching clean air program, California has proposed a low-NOx engine standard for heavy trucks. Truck and engine makers have said in the past that striving for low NOx in diesels could conflict with federal efforts to reduce greenhouse gas emissions by increasing fuel economy.
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