Prior posts have noted that the San Joaquin Valley AQMD has developed an indirect source rule that takes into account secondary emissions from project development and operational activities. The Los Angeles AQMB has started work on such a rule. In addition, the various local air districts who collectively regulate the Sacramento Valley are starting the process. All of these rules or proposals are controversial. The underlying thesis of all of these rules is that proponents of large land developments would be required to limit vehicle trips generated by their developments.
Now, the Bay Area (SF-Oakland) AQMB is beginning work on such a rule. Few details have been provided. However, it seems reasonable to assume that the rule will look a lot like the San Joaquin rule. [See San Joaquin AQMD Rule 9510 at http://www.valleyair.org/rules/currntrules/r9510.pdf.] The Bay Area is also designing the fees that will be attendant thereto.
Information on the Bay Area activity can be found at http://www.baaqmd.gov/pln/ruledev/isr/0300_req_031809.pdf.