CARB gets approval for new truck NOx emissions options

By Charlie Morasch, Land Line contributing writer | Thursday, December 11, 2014

The California Air Resources Board recently got a thumbs up for several optional emissions standards that truck owners can select when ordering new trucks and engines.

According to a recent email message sent and also posted on the air quality agency’s website, the California Office of Administrative Law approved optional reduced emissions standards dealing with oxides of nitrogen, or NOx.

The new standards include the following: .1 grams per brake horsepower-hour, .05 grams per brake horsepower-hour, and .02 grams per brake horsepower hour.

CARB has detailed optional, lower-than required NOx standards during the past 15 years.

“Such optional standards allowed local air districts and ARB to preferentially provide incentive funding to the purchasers of cleaner trucks, which encouraged the development of cleaner engines,” CARB wrote in the email.

The state Office of Administrative Law also approved new regulations establishing greenhouse gas emissions standards for medium- and heavy-duty diesel engines. Both the Greenhouse Gas Emissions Rule amendments and the new NOx options were approved by CARB’s board in December 2013.

The Greenhouse Gas Emissions Rule amendments harmonize California’s standards with existing federal greenhouse gas emissions standards.

The federal standards were adopted jointly by the U.S. Environmental Protection Agency and the U.S. Department of Transportation’s National Highway Traffic Safety Administration in 2011, and were the first such national greenhouse gas emissions standards approved by the federal government. They’re being phased in for truck model years 2014 through 2019.

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