SIP Approval: District of Columbia (1997 eight-hour ozone and 1997/2006 fine particulate matter (PM) NAAQS).

FWS determined threatened status for the salmon-crested cockatoo throughout its range under the ESA.

FWS designated approximately 14,069 acres in the Mojave Desert in San Bernardino County, California, as critical habitat for Lane Mountain milk-vetch.

FWS reissued final rulemaking that identifies the northern Rocky Mountain population of gray wolf as a distinct population segment and removes most gray wolves from the list of endangered and threatened wildlife under the ESA.

EPA withdrew rulemaking that granted a site-specific treatment variance to U.S. Ecology Nevada in Beatty, Nevada, and withdrew an existing site-specific treatment variance issued to Chemical Waste Management, Inc. in Kettleman Hills, California, due to adverse comment.

EPA approved revisions to Wisconsin's hazardous waste management program.

SIP Approval: Mississippi (incorporation of nitrogen oxide (NOx) as a precursor to ozone).

SIP Approval: Massachusetts (delegation of authority for PSD program)

SIP Approval: Minnesota (sulfur dioxide (SO2) emissions).

SIP Approval: Indiana (updates to definitions)