The Guide to Air Quality Assessment in Sacramento County (CEQA Guide) provides methods to analyze air quality impacts from plans and projects, including screening criteria, thresholds of significance, calculation methods, and mitigation measures to assist lead agencies in complying with the California Environmental Quality Act (CEQA). The CEQA Guide is available to download by individual chapters.
Title and Table of Contents
Chapter 1: Introduction (July 2019) NEW
Chapter 1: Link to current Air Monitoring Stations Map
Chapter 2: Environmental Review (July 2019) NEW
Chapter 2 Appendix: Thresholds of Significance Table (May 2015)
Chapter 3: Construction (April 2019)
Chapter 3 Appendix: Basic Construction Emission Control Practices (Best Management Practices) (July 2019) NEWChapter 3 Appendix: Enhanced On-Site Exhaust Controls (April 2019) Chapter 3 Appendix: Enhanced Fugitive PM Dust Control Practices (December 2009)Chapter 3 Appendix: Dispersion Modeling of Construction-Generated PM10 Emissions (July 2013)Chapter 3 Appendix: Off-Site Construction Mitigation Fees (April 2019)
Chapter 3 Appendix: Basic Construction Emission Control Practices (Best Management Practices) (July 2019) NEW
Chapter 3 Appendix: Enhanced On-Site Exhaust Controls (April 2019)
Chapter 3 Appendix: Enhanced Fugitive PM Dust Control Practices (December 2009)
Chapter 3 Appendix: Dispersion Modeling of Construction-Generated PM10 Emissions (July 2013)
Chapter 3 Appendix: Off-Site Construction Mitigation Fees (April 2019)
Chapter 4: Operational (July 2019) NEW
Chapter 4 Appendix: Operational Screening Table (April 2018) Chapter 4 Appendix: PM Best Management Practices (August 2016)Chapter 4 Appendix: CO Dispersion Modeling (June 2014)
Chapter 4 Appendix: Operational Screening Table (April 2018)
Chapter 4 Appendix: PM Best Management Practices (August 2016)
Chapter 4 Appendix: CO Dispersion Modeling (June 2014)
Chapter 5: Toxic Air Contaminants (September 2018)
Chapter 6: Greenhouse Gases (May 2018)
Chapter 6 Appendix: GHG Operational Screening Table (April 2018)Chapter 6 Appendix: Construction GHG Reductions (May 2016)
Chapter 6 Appendix: GHG Operational Screening Table (April 2018)
Chapter 6 Appendix: Construction GHG Reductions (May 2016)
Chapter 7: Odors (June 2016)
Chapter 7 Appendix: Odor Screening Table (December 2009)Chapter 7 Appendix: Odor Reductions (June 2014)
Chapter 7 Appendix: Odor Screening Table (December 2009)
Chapter 7 Appendix: Odor Reductions (June 2014)
Chapter 8: Cumulative (July 2019) NEW
Chapter 9: Program Level Analysis (August 2016)
Sac Metro Air District recommends these tools and guidance documents to assist in air quality impact analysis.
California Emissions Estimator Model including User's Guide (Sac Metro Air District recommends using CalEEMod Version 2016.3.2 for projects being released for public review on or after January 1, 2018).
Sac Metro Air District CalEEMod User's Tips (February 2019)
Roadway Construction Emissions Model (version 9.0, May 2018). This is a .zip file. Please save it and then open it to extract the .xlsm file. IMPORTANT NOTE: U.S. EPA approved EMFAC2017 on August 15, 2019. Version 9.0 includes emissions factors from EMFAC2017.
Version 8.1.0 included emissions factors from EMFAC2014 and was available for analysis of projects requiring federal involvement during the time period EMFAC2017 was being reviewed by U.S. EPA. Consult the Sac Metro Air District staff regarding the appropriate use of version 8.1.0 (version 8.1.0).
Harborcraft, Dredge and Barge Emission Factor Calculator for obtaining emission factors from marine equipment for planning and construction analysis (July 2017)
AERMOD meteorological data files (These are .zip files. Please save the files and then open them to extract the PFL and SFC files):
Adopted Thresholds of Significance:
Sac Metro Air District staff hosted a workshop on January 9, 2019, to discuss and receive feedback on the draft proposed update to the greenhouse gas threshold of significance for operational emissions from land development projects. Download the workshop notice, report and presentation:
Staff report on proposed update - SUPERSEDED by December 2019 report
NEW Sac Metro Air District staff hosted a workshop on December 9, 2019, at 10:30 a.m. to present a new proposal for greenhouse gas thresholds. The new proposal was developed after considering feedback and comments received at the January workshop. Download the workshop notice, presentation and report:
Summary of draft greenhouse gas best management practices (December 2019)
Comments were requested on the greenhouse gas thresholds by January 17, 2019.
Recommended mitigation measures for construction and operational emissions
Mobile Sources Air Toxics Protocol for assessing potential cancer risk to receptors located near major roadways and railways (July 2018)
Landscaping Guidance for Improving Air Quality near Roadways (April 2017)
General Rules Statement for Development Projects (June 2018)
State CEQA Guidelines Appendix G (June 2019, courtesy of AEP)
Sacramento Area Council of Government (SACOG) Regional Plans
In August 2018 the California Air Pollution Control Officers Association (CAPCOA) published Air Quality Analysis in CEQA Roadway Review to address frequently questioned topics in air quality analysis, including greenhouse gases, for roadway projects reviewed under CEQA. The guidance is intended for use by lead agencies in preparing air quality analysis and by air districts in reviewing and commenting on roadway project CEQA documents. Please note that this is not comprehensive
guidance on air quality analysis for CEQA review of roadway projects. It only
responds to common questions and current misconceptions. Air districts often
have guidance on a full range of topics in CEQA air quality analysis, which is
appropriate for overall air quality analysis in their geographic area. Please
consult any of the Sac Metro Air District staff listed below to determine the
appropriate methodology for project specific CEQA analysis.
In December 2018 the California Supreme Court issued a decision in the Sierra Club v. County of Fresno case regarding the Friant Ranch project ((2018) 6 Cal. 5th 502). The Court determined the air quality analysis include a reasonable effort to connect a project's air quality impacts to likely health consequences or explain in meaningful detail why it is not feasible to do so. This type of health analysis has not been conducted for CEQA analysis normally. Sac Metro Air District prepared Interim Guidance to address the Friant Ranch decision while a methodology is being developed to provide a standardized health related analysis.
NEW Sac Metro Air District with its consultant Ramboll prepared a DRAFT Guidance to Address the Friant Ranch Ruling for CEQA Projects in the Sac Metro Air District (January 31, 2020). The guidance provides screening health information for projects at or below regional CEQA thresholds of significance emissions levels and selected strategic areas above thresholds of significance emissions levels. Modeling guidance for large projects located outside strategic areas is also included.
Instructions for Screening Tools (January 31, 2020)
Latitude/Longitude Look Up (January 31, 2020, .zip file, includes Google Earth kmz file)
Minor Project Health Screening Tool (February 3, 2020, .xlsx file)
Strategic Area Project Health Screening Tool (February 3, 2020, .xlsx file)
Comments are requested on the draft guidance by February 28, 2020.
Comments may be sent via email to Karen Huss at email@example.com.
916-874-4882 / firstname.lastname@example.org
916-874-4885 / email@example.com