California Air Resources Board

This almanac was prepared and published by the staff of the Air Quality Planning and Science Division, California Air Resources Board. Principal authors: Paul Andrews, Andy Delao, and Anna Komorniczak.

This document has been reviewed and approved by CARB staff. Approval does not signify that the contents necessarily reflect the views and policies of CARB.

The almanac is currently available for download in its entirety or by section. In addition, individual data tables from the almanac are available in comma separated (.csv) formats or you can download a zipped version of all tables.

For general information about the almanac or questions about the air quality data, contact Paul Andrews. For questions about the emissions data, contact the Emission Inventory Branch.

Notice: Early versions of the CD and web version of the 2013 Almanac had some incorrect emissions values. For more details on changes made, see the Errata Sheet.

• Preface and Table of Contents
• Chapter 1: Introduction
• Chapter 2: Current Emissions and Air Quality
• Chapter 3: Statewide Emission Trends and Forecasts
• Chapter 4: Regional Trends and Forecasts
• Appendix A: Air Quality Trend Data by Pollutant: Ozone, PM_2.5, CO, NO₂, SO₂
• Appendix B: County Level Emissions and Air Quality by Air Basin
• Appendix C: Surface Area, Population, and Average Daily Vehicle Miles Traveled
• Appendix D: Natural Sources
• Appendix E: Lists of Figures and Tables for Chapters 1 through 4

The air quality trends presented in the California Almanac of Emissions and Air Quality - 2013 Edition represent a summary of data collected at a number of monitoring sites. Whenever data are summarized, the results can be influenced by many factors, including the number of monitoring sites in the network, the opening and closing of critical sites, and the completeness of the data. The following document, updated during December 1998, provides information that is helpful for interpreting air quality trends in the 2013 Almanac.