Wood Burning Fireplaces
Air Quality Management District (AQMD) rule 445 prohibits the installation of wood burning fireplaces in both new and existing developments with a few exceptions. Only gas burning decorative appliances and fireplaces (factory made and site built) with a listed gas log permanently affixed to its base may be installed. The chimney damper must be permanently blocked open if a gas log is added to a fireplace.
Please see the AQMD website for a summary of the rules (http://www.aqmd.gov/healthyhearths/PDFDocuments/Rule445Summary.pdf),
The text of the AQMD law