• California gets green light: EPA grants waivers for Advanced Clean Cars II (ACC II) and Low-NOx regulations, allowing stricter state emissions standards.
• Significant health benefits projected: Regulations aim to cut smog-forming pollutants and greenhouse gas emissions, improving public health.
• Sets precedent for state-led initiatives: The decision reinforces California’s role as a leader in environmental policy under the Clean Air Act.

The U.S. Environmental Protection Agency (EPA) has granted California the authority to implement its Advanced Clean Cars II (ACC II) regulations and low-NOx standards for heavy-duty and off-road vehicles. These waivers empower California to enforce stricter emissions standards than federal requirements, a right afforded under the Clean Air Act to combat the state’s severe air quality challenges.

“California has longstanding authority to request waivers from EPA to protect its residents from dangerous air pollution,” said EPA Administrator Michael S. Regan. “Today’s actions follow through on EPA’s commitment to partner with states to reduce emissions and act on the threat of climate change.”

The Impact of ACC II and Low-NOx Rules

The ACC II program, targeting model years 2026–2035, integrates updates to California’s Low Emission Vehicle (LEV) and Zero Emission Vehicle (ZEV) regulations. The program is projected to reduce pollutants like PM2.5, NOx, and hydrocarbons, which contribute to smog and public health issues.

According to CARB, “These measures will protect communities from harmful pollutants that exacerbate asthma, increase hospitalizations, and cause lost work and school days.”

The Low-NOx regulations focus on curbing nitrogen oxide emissions, a primary contributor to ground-level ozone (smog), with expected reductions in illnesses and health costs.

Related Article: California Delays Full Enforcement of Climate Reporting Rules for FY 2025

EPA’s Review and Decision

The EPA conducted a comprehensive review of public comments from stakeholders, including governments, environmental organizations, and industry. Opponents failed to demonstrate inconsistency with the Clean Air Act, leading to EPA’s approval.

A National Precedent

California’s regulations set a benchmark for other states considering stricter emissions standards. The EPA’s decision highlights the importance of state-led initiatives in advancing clean air policies and addressing climate change.

For more information on California waivers and their administrative process, visit EPA’s dedicated webpage on California Waivers and Authorizations.

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