The California Almanac of Emissions and Air Quality - 2013 Edition

This page last reviewed May 21, 2014

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

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

The almanac is currently available for download in PDF format. You may download the entire document (PDF - 9.9 MB), or you may view the contents of each section in PDF format by clicking on the links provided below. The PDF files may be navigated page-by-page or with the bookmark navigation pane which will be opened automatically.

In addition to the PDF files, individual data tables from the almanac are available for download in both Excel(.xls) and text (.txt) formats. The tables for each chapter and appendix can be accessed by clicking below on the links to the Preface and Table of Contents or the links to the individual chapters and appendices. Alternatively, you may click here to download a zipped version of all the tables in Excel format (1.1 MB) or text format (137 KB).

For general information about the almanac or questions about the air quality data, please contact Paul Cox ( For questions about the emissions data, please contact Andy Delao (

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.

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 Alamanac.

Clarifying Information for Interpreting Air Quality Trends

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