Users should note that EPA has established a distinct database containing EPA Guidance pursuant to Executive Order (EO) 13891, titled "Promoting the Rule of Law Through Improved Agency Guidance Documents." Some of the documents included in this NSR Policy Guidance Database are also included in EPA’s EO 13891 database. 

EPA intends to continue maintaining and populating this NSR Policy Guidance Database as the Agency has in the past. This database contains documents that meet the definition of “guidance” in paragraph 2(b) of EO 13891 and documents that are not covered by that definition, such as adjudications and statements directed to particular parties about circumstance-specific questions. This NSR Policy Guidance Database also includes guidance that is no longer active, but that may be referenced to establish historical facts. More information on the scope of the documents organized in the topic index can be found here.

New Source Review Applicability 

• Stationary Source of Air Pollution
• Single Source Determinations

• Begin Actual Construction
• Commence Construction

• Regulated NSR Pollutants & Associated Calculations
• 28 PSD Source Categories
• Temporary Emissions
• Limiting Potential to Emit
• Fugitive Emissions
• Excess Emissions During Periods of Startup, Shutdown, or Malfunction
• Secondary Emissions
• Reactivation of a Shutdown Source/Emissions Unit
• Plantwide Applicability Limits (PALs)

• Physical Change or Change in the Method of Operation
• Alternative Fuels Exclusion
• Routine Maintenance, Repair and Replacement
• Replacement Units (Under the 2003 Rule)
• Major Modification Applicability Test
  • STEP 1: Emissions Increase Calculation (Project Emissions Increase)
    • Project Aggregation
    • Debottlenecked Sources
  • STEP 2: Emissions Netting (Contemporaneous Netting)

Best Available Control Technology (BACT) 

Ambient Air Modeling & Monitoring 

Class I Areas 

Nonattainment New Source Review 

Post-Issuance Permit Activities 

Implementation of New Source Review (NSR) Program