California Air Resources Board (CARB) evaluates feasibility of 90% NOx reduction

Niels Tholen - 31 July 2013

The California Air Resources Board (CARB) is currently evaluating the feasibility of a 90% reduction in the NOx limit for heavy-duty engines. CARB is looking into lowering the NOx limit from the 2010 standard of 0.20 g/bhp-hr to 0.02 g/bhp-hr and has partnered with Southwest Research Institute (SwRI) to evaluate the technologies for NOx reduction.

The reason for this investigation is the upcoming National Ambient Air Quality Standard (NAAQS) requirement and the state's difficulty in reaching the PM 2.5 and ozone limits without further decreasing NOx.

One 2010-certified natural gas engine and one 2010-certified diesel engine will be tested together with candidate exhaust aftertreatment systems, such as advanced Selective Catalytic Reduction (SCR) and three-way catalyst systems, to assess the possibility of lowering NOx emissions.

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