California Air Resources Board

The stringency of the controls required by BACT varies across the state, based on the region's attainment status and the requirements outlined in each air district's BACT policy.  It is important to note, that not all air districts generate BACT determinations or guidelines.  Unless a district has a unique source, many smaller districts rely upon the BACT limits determined by larger districts to permit equipment.  The districts listed below have individual BACT policies that help further define the criteria for each district's BACT program.