Benefits of adopting California medium- and heavy-duty vehicle regulations

In recent years, the State of California has adopted key regulations to reduce greenhouse gas and criteria pollutant emissions from medium- and heavy-duty vehicles. The Advanced Clean Trucks (ACT) rule requires the sale of at least 30% zero-emission trucks by 2030; the HDV Omnibus rule requires a 90% reduction in NOx emissions from model year 2027 engines; and the California Phase 2 greenhouse gas rule includes efficiency standards for tractor-trailers, which the federal government has not implemented.

In pursuit of air quality and climate goals, more than a dozen U.S. states, the District of Columbia, and recently the Province of Quebec have joined California in a multi-state effort to achieve 30% zero emission medium- and heavy-duty sales by 2030. These sub-national governments share a goal of 100% zero emission sales and are working together to further reduce emissions from internal combustion engines.

Under the U.S. Clean Air Act Section 177, states can enact regulations more stringent than federal requirements provided the U.S. Environmental Protection Agency grants California a waiver from federal requirements and states delay implementation by two model years.

The data below provides information on the benefits of adopting California heavy-duty vehicle emissions control programs in U.S. states and the District of Columbia. These programs include the Advanced Clean Trucks (ACT) regulation, the Heavy-Duty Omnibus regulation, and full implementation of the California HD Vehicle Greenhouse Gas (GHG) Phase 2 regulation, including requirements on tractor-trailers.

The related consulting report can be found here.
A fact sheet summarizing the findings can be found here.

The state-specific data can be found below:

Colorado (Updated: 10/29/21)
Connecticut (Updated: 10/29/21)
District of Columbia (Updated: 10/29/21)
Maine (Updated: 10/29/21)
Maryland (Updated: 10/29/21)
Massachusetts (Updated: 10/29/21)
North Carolina (Updated: 10/29/21)
New Jersey (Updated: 10/29/21)
Oregon (Updated: 10/29/21)
Pennsylvania (Updated: 10/29/21)
Rhode Island (Updated: 10/29/21)
Vermont (Updated: 10/29/21)
Washington (Updated: 12/15/21)