CARB proposes optional reduced NOx emission standards for heavy-duty engines

Niels Tholen - 18 April 2013

The California Air Resources Board (CARB) has proposed new optional NOx emission standards for heavy-duty engines.

NOx emission limits would be cut below the current 0.2 grams per brake horsepower-hour (g/bhp-pr) and the proposed standards could be as low as 0.02 g/bhp-hr.

According to CARB, the new legislation was proposed as it felt that even if the heavy-duty fleet would comply with 2010 standards, it would still exceed federal Ambient Air Quality Standards for Particulate Matter (PM) and ozone, production of both contributed by NOx.

CARB also hopes this new optional legislation will incentivise OEMs to showcase alternative technologies; funding could be obtained by programs such as the Carl Moyer Memorial Air Quality Standards Attainment program.

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