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Planning for Clean Air

State Implementation Plans

States have to develop state implementation plans (SIPs) that explain how each state will do its job under the Clean Air Act. A state implementation plan is a collection of the regulations a state will use to clean up polluted areas. The states must involve the public, through hearings and opportunities to comment, in the development of each state implementation plan. It may be helpful to view a SIP as a state's blueprint for clean air.


Each year in the U.S., industrial operations emit nearly 100 million tons of pollutants into the air. These include pollutants that make breathing difficult, form urban smog, impair visibility, and attack ecosystems. Some of these pollutants can cause cancer or other serious health effects. Some of the many pollutants emitted into the air each year are sulfur dioxide, nitrogen dioxides, carbon monoxide, benzene, mercury and dioxin. Many of the sources of this air pollution are large facilities, such as petroleum refineries and chemical plants, that can have literally thousands of potential emission points. Other pollution sources can be smaller, such as gasoline filling stations, dry cleaning operations, and paint spray booths. Several of these air pollution sources, particularly the larger sources, are required by federal measures to reduce emissions and to obtain air pollution permits to ensure compliance.

Emission Inventories

EPA's Emission Inventory and Analysis Group prepares a national database of air emissions information with input from numerous State and local air agencies, from tribes, and from industry. The NEI Input Format (NIF) is the format most widely used by state and local agencies to transfer data to the EPA's National Emission Inventory (NEI).

Air Quality Modeling

EPA's Air Quality Modeling Group conducts modeling analyses to support policy and regulatory decisions in the Office of Air and Radiation and provides leadership and direction on the full range of air quality models and other mathematical simulation techniques used in assessing air pollution control strategies. Documentation and guidance for these air quality models can be found on the Support Center for Regulatory Air Models (SCRAM) website, including downloadable computer code, input data, and model processors.

Air Quality Conformity

Established under the Clean Air Act (section 176), conformity plays an important role in helping states and tribal regions improve air quality in those areas that do not meet the National Ambient Air Quality Standards (NAAQS). Under the separate general and transportation conformity rules, federal agencies must work with State, Tribal and local governments in nonattainment and maintenance areas to ensure that federal actions, including highway and transit projects, conform to the initiatives established in the applicable state or tribal implementation plan.

New Jersey
Federal Highway Administration New Jersey Division
Federal Transit Administration Region 2
New Jersey Department of Transportation
Metropolitan Planning Organization Counties Covered
Delaware Valley Regional Planning Commission Burlington, Camden, Gloucester, Mercer
North Jersey Transportation Planning Authority Bergen, Essex, Hudson, Hunterdon, Middlesex, Monmouth, Morris, Ocean, Passaic, Somerset, Sussex, Union, Warren
South Jersey Transportation Planning Organization Atlantic, Cape May, Cumberland, Salem
New York
Federal Highway Administration New York Division
Federal Transit Administration Region 2
New York State Department of Transportation
Metropolitan Planning Organization Counties Covered
Adirondack/Glens Falls Transportation Council Warren, Washington, and the Town of Moreau
Capital District Transportation Committee Albany, Rennsalaer, Saratoga, Schenectady
Greater Buffalo-Niagara Region Transportation Council Erie, Niagara
Genesee Transportation Council Genesee, Livingston, Monroe, Ontario, Orleans, Seneca, Wayne, Wyoming, Yates
New York Metropolitan Transportation Council Bronx, Kings, Nassau, New York, Putnam, Queens, Richmond, Rockland, Suffolk, Westchester
Orange County Transportation Council Orange
Poughkeepsie-Dutchess County Transportation Council Dutchess
Syracuse Metropolitan Transportation Council Onondaga
Puerto Rico and the U.S. Virgin Islands
Federal Highway Administration Puerto Rico and the U.S. Virgin Islands Division
Federal Transit Administration Region 4
Puerto Rico Departamento de Transportacion y Obras Publicas


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