California Air Resources Board

A key measure in the Mobile Source Strategy is the establishment of low oxides of nitrogen (NOx) engine emission standards that result in a 90 percent reduction in NOx emissions compared to the emissions of today's diesel engines. This measure is critical for attaining federal health-based air quality standards for ozone in 2031 in the South Coast and San Joaquin Valley air basins, and fine particulate matter (PM2.5) standards in the next decade.
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