SIP Approval: California (interim deferral of sanctions for the San Joaquin Valley unified air pollution control district's fee program). 

SIP Approval: California (limited approval of permitting rules for the Placer County air pollution control district and the Feather River air quality management district). 

SIP Approval: California (limited approval of NSR and PSD permit programs). 

SIP Approvals: Alabama (1997 eight-hour ozone NAAQS)

EPA updated outer continental shelf air regulations for Virginia.

SIP Approval: California (volatile organic compound (VOC) emissions for the Northern Sierra, Sacramento Metropolitan, and South Coast air quality management districts). 

EPA determined that Tennessee failed to submit an SIP for the 2006 24-hour NAAQS for fine particulate matter (PM). 

EPA finalized a federal implementation plan (FIP) that includes two new source review (NSR) regulations for the protection of air resources in Indian country: the first rule applies to new and modified minor stationary sources (minor sources) and to minor modifications at existing major stationary sources (major sources) throughout Indian country; the second rule applies to new and modified major sources in areas of Indian country that are designated as not attaining the NAAQS.

SIP Approval: California (VOC emissions for the South Coast air quality management district). 

SIP Approval: California (limited approval of VOC emission revisions for the San Joaquin Valley unified air pollution control district).