Federal environmental regulations
A plain-language index to the parts of Title 40 — the federal code for environment and climate — that matter most for New Jersey residents, businesses, and communities. Every entry links to the current official text on eCFR.gov.
Title 40 last amended: October 22, 2026 (sourced live from ecfr.gov)
Air Quality
- 40 CFR Part 50View on eCFR.gov ↗National Primary and Secondary Ambient Air Quality Standards
The federal air-quality targets (NAAQS) — EPA's limits on pollutants like ozone, particulate matter, NOx, and SO2 that every state must meet.
- 40 CFR Part 60View on eCFR.gov ↗Standards of Performance for New Stationary Sources
Emission limits for new and modified industrial sources — power plants, refineries, landfills, etc. This is where new EPA rules on greenhouse gas emissions from power plants live.
- 40 CFR Part 61View on eCFR.gov ↗National Emission Standards for Hazardous Air Pollutants
Strict emission caps for the most dangerous air pollutants (benzene, asbestos, mercury, etc.) from stationary sources.
- 40 CFR Part 63View on eCFR.gov ↗National Emission Standards for Hazardous Air Pollutants for Source Categories
The expanded MACT (Maximum Achievable Control Technology) standards — sets hazardous-pollutant limits per industry category.
- 40 CFR Part 81View on eCFR.gov ↗Designation of Areas for Air Quality Planning Purposes
The official map of which counties are meeting federal air standards (attainment) vs. which are not (nonattainment). Several NJ counties are designated nonattainment for ozone.
Greenhouse Gases
Transportation
- 40 CFR Part 86View on eCFR.gov ↗Control of Emissions From New and In-Use Highway Vehicles and Engines
Federal tailpipe emission standards for cars and trucks — the rules that push the market toward cleaner and electric vehicles.
- 40 CFR Part 88View on eCFR.gov ↗Clean-Fuel Vehicles
Definitions and requirements for clean-fuel vehicles and fleet programs.
- 40 CFR Part 600View on eCFR.gov ↗Fuel Economy and Greenhouse Gas Exhaust Emissions of Motor Vehicles
Vehicle fuel-economy labeling (the MPG sticker) and the CO2 exhaust standards tied to it.
- 40 CFR Part 1037View on eCFR.gov ↗Control of Emissions From New Heavy-Duty Motor Vehicles
Greenhouse gas and efficiency standards for new trucks and buses — EPA's Phase 2 and Phase 3 rules.
- 40 CFR Part 1065View on eCFR.gov ↗Engine-Testing Procedures
The official test protocols EPA uses to measure vehicle and engine emissions under the standards in Parts 86 and 1037.
State Plans & Permits
- 40 CFR Part 51View on eCFR.gov ↗Requirements for Preparation, Adoption, and Submittal of Implementation Plans
How states must design and submit their plans for meeting federal air-quality standards. Sets the rules NJ's State Implementation Plan has to follow.
- 40 CFR Part 52View on eCFR.gov ↗Approval and Promulgation of Implementation Plans
EPA's approvals (and disapprovals) of each state's air-quality plan. Subpart FF is where you'll find every federally-approved amendment to New Jersey's SIP.
- 40 CFR Part 70View on eCFR.gov ↗State Operating Permit Programs
Rules for how states run Title V operating permits for major polluting facilities — NJ issues these through DEP.