The Clean Air Act (CAA) sets out specific requirements for a group of northeast states that make up the Ozone Transport Region (OTR). States in this region are required to submit a SIP and install a certain level of controls for the pollutants that form ozone, even if they meet the ozone standards.

The CAA contains specific requirements governing requirements for nonattainment areas and for all areas included in the OTR. For certain requirements, EPA issues regulatory interpretations of required SIP elements in the Code of Federal Regulations (CFR) part 51. EPA has also issued guidance in the form of "General Preambles" and through policy documents that can be found on the EPA website.

For more information, see:

• 2008 ozone NAAQS -- 40 CFR 51.1116: Requirements for an Ozone Transport Region
• 2015 ozone NAAQS -- 40 CFR 51.1316: Requirements for an Ozone Transport Region

8-hour Ozone Area and Ozone Transport Region (OTR) Requirements

• Clean Fuels for Boilers
• Clean Fuels for Fleets 182(c)(4)
• Contingency Measures for VOC and NOX
• Contingency Provisions for RFP Milestones 182(c)(9)
• Emission Inventory
• Emission Statement
• Enhanced Monitoring (PAMS)
• I/M Basic
• I/M Enhanced Nonattainment
• NSR program (for current classification)
• Ozone Attainment Demonstration (including emissions limits and other control measures adopted by the state)
• RACT Non-CTG VOC for Major Sources
• RACT NOX for Major Sources
• RACT VOC CTG Aerospace
• RACT VOC CTG Auto and Light-Duty Truck Assembly Coatings(2008)
• RACT VOC CTG Bulk Gasoline Plants
• RACT VOC CTG Equipment Leaks from Natural Gas/Gasoline Processing Plants
• RACT VOC CTG Factory Surface Coating of Flat Wood Paneling
• RACT VOC CTG Fiberglass Boat Manufacturing Materials (2008)
• RACT VOC CTG Flat Wood Paneling Coatings (2006)
• RACT VOC CTG Flexible Packaging Printing Materials (2006)
• RACT VOC CTG Fugitive Emissions from Synthetic Organic Chemical Polymer and Resin Manufacturing Equipment
• RACT VOC CTG Graphic Arts - Rotogravure and Flexography
• RACT VOC CTG Industrial Cleaning Solvents (2006)
• RACT VOC CTG Large Appliance Coatings (2007)
• RACT VOC CTG Large Petroleum Dry Cleaners
• RACT VOC CTG Leaks from Gasoline Tank Trucks and Vapor Collection Systems
• RACT VOC CTG Leaks from Petroleum Refinery Equipment
• RACT VOC CTG Lithographic Printing Materials and Letterpress Printing Materials (2006)
• RACT VOC CTG Manufacture of High-Density Polyethylene, Polypropylene, and Polystyrene Resins
• RACT VOC CTG Manufacture of Pneumatic Rubber Tires
• RACT VOC CTG Manufacture of Synthesized Pharmaceutical Products
• RACT VOC CTG Metal Furniture Coatings (2007)
• RACT VOC CTG Miscellaneous Industrial Adhesives (2008)
• RACT VOC CTG Miscellaneous Metal Products Coatings (2008)
• RACT VOC CTG Paper, Film, and Foil Coatings (2007)
• RACT VOC CTG Petroleum Liquid Storage in External Floating Roof Tanks
• RACT VOC CTG Plastic Parts Coatings (2008)
• RACT VOC CTG Refinery Vacuum Producing Systems, Wastewater Separators, and Process Unit Turnarounds
• RACT VOC CTG SOCMI Air Oxidation Processes
• RACT VOC CTG SOCMI Distillation and Reactor Processes
• RACT VOC CTG Shipbuilding/repair
• RACT VOC CTG Solvent Metal Cleaning
• RACT VOC CTG Stage I Vapor Control Systems - Gasoline Service Stations
• RACT VOC CTG Storage of Petroleum Liquids in Fixed Roof Tanks
• RACT VOC CTG Surface Coating for Insulation of Magnet Wire
• RACT VOC CTG Surface Coating of Automobiles and Light-Duty Trucks
• RACT VOC CTG Surface Coating of Cans
• RACT VOC CTG Surface Coating of Coils
• RACT VOC CTG Surface Coating of Fabrics
• RACT VOC CTG Surface Coating of Large Appliances
• RACT VOC CTG Surface Coating of Metal Furniture
• RACT VOC CTG Surface Coating of Miscellaneous Metal Parts and Products
• RACT VOC CTG Surface Coating of Paper
• RACT VOC CTG Tank Truck Gasoline Loading Terminals
• RACT VOC CTG Use of Cutback Asphalt
• RACT VOC CTG Wood Furniture
• RFP VOC and NOX (for current classification)
• Severe/Extreme Area Fee Program (Section 185)
• Stage II vehicle refueling vapor recovery or Equivalent
• VMT - TCMs to Offset Growth