76 FR 20237
SIP Approval: District of Columbia (1997 eight-hour ozone and 1997/2006 fine particulate matter (PM) NAAQS).
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75 FR 79300
SIP Approval: Mississippi (incorporation of nitrogen oxide (NOx) as a precursor to ozone).
76 FR 31241
SIP Approval: Massachusetts (delegation of authority for PSD program)
75 FR 81471
SIP Approval: Minnesota (sulfur dioxide (SO2) emissions).
76 FR 27904
SIP Approval: Indiana (updates to definitions)
75 FR 78602
SIP Approval: Minnesota (PM emissions).