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MassDEP Files New Regulations to Reduce Emissions
11:11AM / Tuesday, January 04, 2022
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BOSTON — The Massachusetts Department of Environmental Protection (MassDEP) announced that emergency regulations have been filed with the Secretary of the Commonwealth's office to immediately adopt California's Advanced Clean Trucks regulation, which requires an increasing percentage of ZEV truck sales starting with Model Year 2025 and ramping up through Model Year 2035, accelerating the market for medium- and heavy-duty ZEVs. 
The filing of the emergency regulations commences the start of a public comment period and the coordination of a public hearing in February 2022, and will help reduce emissions of nitrogen oxides (NOx), toxic air contaminants, and greenhouse gases from on-road vehicles.
"Massachusetts continues to take aggressive action to reduce emissions from the transportation sector, and addressing pollution from medium- and heavy-duty vehicles and advancing the market for clean trucks is an essential part of this effort," said Energy and Environmental Affairs Secretary Kathleen Theoharides. "Reducing emissions from trucks will help support public health by improving air quality, reducing the risk from exposure to toxic diesel pollution, and reducing emissions that contribute to climate change."
Massachusetts law requires the Commonwealth to adopt California motor vehicle emissions standards as long as those standards achieve, in the aggregate, greater emissions reductions than federal standards. Massachusetts first adopted the California Low Emission Vehicle (LEV) program regulations in 1991 and has amended it many times to remain identical to the California LEV program. This latest amendment involves emission standards for Model Years 2025 and later medium- and heavy-duty vehicles and engines.
"The transportation sector accounts for about 40 percent of the total greenhouse gas emissions statewide. Adopting California's regulations will help to reduce air pollution across the Commonwealth and protect our environment and the public health," said MassDEP Commissioner Martin Suuberg. "Adoption of these rules will also address environmental justice concerns in communities that are disproportionately impacted by medium- and heavy-duty vehicle traffic."
Emergency authorization of the regulation was needed as the federal Clean Air Act (CAA) requires states that adopt the California standards to do so at least two model years before the standards take effect – in this case, Jan. 1, 2022 for vehicles labeled as Model Year 2025, which starts on Jan. 1, 2024. Today's filing begins a three-month process towards making the emergency regulations permanent, which will include a public hearing on the amendment set for Jan. 21, 2022, and a 30-day public comment period which ends on Jan. 31, 2022. 
The emergency regulations adopt the latest revisions to the California medium- and heavy-duty vehicle and engine regulations. Those revisions include: the Greenhouse Gas (GHG) Phase 2 Standards for Model Year 2025; the Heavy-Duty Omnibus Regulation, which contains a comprehensive set of emission standards and other emission-related requirements for heavy-duty vehicles and engines; and the Advanced Clean Trucks Regulation, resulting in ZEV sales starting in Model Year 2025 and ramping up through Model Year 2035, accelerating the market for medium- and heavy-duty ZEVs. In addition to reducing pollutant emissions, the regulations will lead to reduced fuel consumption and fuel costs and maintenance due to more fuel-efficient engines and vehicles and next-generation zero-emission trucks.
MassDEP officials participated in a series of meetings on these rulemakings with the California Air Resources Board (CARB) and joined CARB, the Northeast States for Coordinated Air Use Management and other organizations to develop the new regulations. MassDEP also held two public stakeholder meetings in April 2021 to share information on these regulatory efforts and to solicit stakeholder feedback. Vehicle emissions regulations are part of the Massachusetts plan to maintain air quality standards under the federal Clean Air Act and are a critical component of the Massachusetts Interim Clean Energy and Climate Plan for 2030 under the Massachusetts Global Warming Solutions Act (GWSA). Earlier this year, Governor Baker signed "An Act Creating a Next-Generation Roadmap for Massachusetts Climate Policy" that amended the GWSA to require specified emissions reduction limits for 2030, 2040 and net-zero greenhouse gas (GHG) emissions by 2050. Last year, Massachusetts was one of 15 states and the District of Columbia to set a goal of 100 percent electric truck and bus sales by 2050. Adopting these rules will accelerate the transition to medium- and heavy-duty electric vehicles.
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