EPA approves certain State implementation plan (SIP) revisions submitted by the State of North Dakota with letters dated August 15, 1995 and January 9, 1996. The revisions address air pollution control rules regarding general provisions; open burning; emissions of particulate matter, certain settleable acids and alkaline substances, and fugitives; air pollution emergency episodes; new source performance standards (NSPS); national emission standards for hazardous air pollutants (NESHAPs); and the minor source construction and operating permit programs. The State's January 9, 1996 submittal also revised SIP Chapter 6, Air Quality Surveillance, to identify current activities regarding visibility monitoring. In addition, these submittals included revisions involving the Title V Operating Permits Program, the Acid Rain Program, the restriction of sulfur compound emissions, and emission standards for hazardous air pollutants for source categories, which will be handled separately. Finally, EPA is correcting an incorporation by reference error that was made by EPA in an October 20, 1993 rulemaking regarding the State's regulation for sulfur compounds.