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ISR Home 

The Indirect Source Review (ISR) rule, which went into effect March 1, 2006, requires developers of larger residential, commercial and industrial projects to reduce smog-forming and particulate emissions generated by their projects. The rule is expected to reduce nitrogen oxides and particulates throughout the San Joaquin Valley by more than 10 tons per day by 2010.


California Emissions Estimator Model (CalEEMod)

The San Joaquin Valley Air Pollution Control District transitioned from using URBEMIS to the California Emissions Estimator Model (CalEEMod) when reviewing or preparing air impact assessments in compliance with provisions of District Rule 9510 (Indirect Source Review), California Environmental Quality Act (CEQA), and National Environmental Policy Act (NEPA), within the San Joaquin Valley air basin. CalEEMod is the computer emissions estimating model developed by the California Air Pollution Control Officers Association (CAPCOA). The model calculates criteria pollutant and greenhouse gas (GHG) emissions from a variety of land uses, including residential, commercial, retail, and industrial projects. CalEEMod also calculates the benefits of implementing mitigation measures, including GHG mitigation measures.

Transition from CalEEMod 2016 to CalEEMod 2020

The San Joaquin Valley Air Pollution Control District transitioned to the recently updated version of the California Emissions Estimator Model (CalEEMod), version 2020 which is EPA and District APCO approved, when reviewing or preparing air impact assessments in compliance with provisions of District Rule 9510 (Indirect Source Review). The updated CalEEMod 2020 version, incorporates several changes including but not limited to:

  • The California Air Resources Board (CARB) EMFAC2017 model and the EMFAC2017 Off-Model Adjustment factors from the Safer Affordable Fuel Efficient (SAFE) Rule,
  • The 2019 update to Title 24 California Building Standards,
  • Trip generation rates from the Institute of Transportation Engineers (ITE) 10th Edition .

For more information on CalEEMod, please visit www.caleemod.com

Environmental Documents prepared California Environmental Quality Act (CEQA) / National Environmental Policy Act (NEPA):

  • Air Quality Impact Analyses should be prepared using the CalEEMod 2020 version.

The District recognizes that CEQA can involve long lead times, please contact the District at (559) 230-6000 for project-specific discussions.

Rule 9510 Indirect Source Review (ISR):

  • ISR applications will be analyzed using the CalEEMod 2020 version.

Rule 9510, Indirect Source Review: Air District prevails in national suit over development project construction emissions

On September 19, 2008, the U.S. District Court in Fresno struck down a lawsuit contesting the regulations over development project construction emissions. The Court affirms that the District has the authority to regulate the effects of motor vehicles and equipment attracted to development sites.
Press release

Since 2007, the District has released Annual Report’s on the District's Indirect Source Review Program. Click here to view.