This location includes the most recent version of the area source methods manual. The area source methodologies are organized by the major categories listed below. Within each major category is a description of the available area source methodologies and the responsible agency.
For the methodologies developed by CARB staff, the date of preparation is listed. Summaries of the area source methodologies and the complete text are available.
Major Categories
Fuel Combustion
Waste Disposal
Cleaning Coatings
Petroleum Production
Industrial Processes
Solvent Evaporation
Misc. Processes, dust, combustion, and other sources
Appendix A Agricultural Activity Based Temporal Profiles
Other Mobile Sources
Natural Sources
Meetings and Workshops
| Date | Location | Details | Materials |
|---|
July 11, 2025
10:00 am – 11:00 am PDT | Virtual | The California Air Resources Board (CARB) hosted a public workshop on July 11th to review the Final Report for the Soil Nitrogenous Emissions "Subject Matter Expert Review Panel (SMERP)" Contract (23RD017). The recording of the public workshop as well as the SMERP responses to public questions & comments are now posted under Materials.
Background: As part of the SMERP, Dr. William Horwath (University of California [UC] Davis), Dr. Whendee Silver (UC Berkeley), Dr. Xia Zhu-Barker (University of Wisconsin -Madison), Dr. Martin Burger (California Department of Food and Agriculture [recently retired]; UC Davis), and Dr. Viney Aneja (North Carolina State University) conducted a comprehensive review of scientific literature, pertinent databases, and emission estimation methodologies that pertain to nitrogenous emissions from soils. | - Final Report
- SMERP Presentation
- Recording
- SMERP Responses |
May 28, 2025
3:00 pm – 5:00pm | Virtual | The California Air Resources Board (CARB) invites you to participate in a public workshop to discuss proposed updates to several area source emissions estimation methodologies. These updates are part of CARB’s ongoing commitment to ensuring emissions inventory methods remain scientifically robust and reflective of the latest data. | - Register
- Workshop Notice
- CARB Presentation
- Workshop Recording |
| May 7, 2024 | Virtual | The California Air Resources Board (CARB) invites you to participate in a public workshop to kick-off the Soil Nitrogenous Emissions "Subject Matter Expert Review Panel (SMERP)” Contract (23RD017). As part of the SMERP, Dr. William Horwath (University of California [UC] Davis), Dr. Whendee Silver (UC Berkeley), Dr. Xia Zhu-Barker (University of Wisconsin -Madison), Dr. Martin Burger (California Department of Food and Agriculture [recently retired]; UC Davis), and Dr. Viney Aneja (North Carolina State University) will conduct a comprehensive review of scientific literature, pertinent databases, and emission estimation methodologies that pertain to nitrogenous emissions from soils. Please join the workshop to find out more from the selected SMERP members discussing plans and process through end of contract in 2025. We welcome your feedback and engagement. | - Register
- Workshop Notice
- CARB Presentation
- SMERP Presentation
- Workshop Recording |
February 13, 2025
11:00 am- 12:00 pm PST | Virtual | The California Air Resources Board (CARB) invites you to participate in a second meeting to discuss progress on the Soil Nitrogenous Emissions "Subject Matter Expert Review Panel (SMERP)” Contract (23RD017). The contract will provide CARB with guidance and information on the best scientific evidence for nitrogenous emissions from soils, and will inform the subsequent steps needed to refine the underlying data and methods currently used in our regional air quality modeling to support the State Implementation Plans. Please join the meeting to hear SMERP members discuss progress and plans through the end of the contract in May 2025. We welcome your engagement. | - Register
- Workshop Notice
- SMERP Presentation
- Workshop Recording |
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