Retrofit/Rebuild Requirements for 1993 and Earlier Model Year Urban Buses; Status of Equipment Certified and Emissions Levels To Be Used by Operators Using Option 2

Résumé

In the final rule regarding retrofit/rebuild requirements for 1993 and earlier model year urban buses (58 FR 21359, April 21, 1993), EPA stated that it would review retrofit/rebuild equipment that was certified by July 1994 and publish the post-rebuild particulate matter emission levels for urban bus engines affected by the program. These post-rebuild levels are to be used by operators for calculating their fleet emission levels under Option 2. This Federal Register document fulfills that commitment. As of July 1, 1994, no equipment had been certified for the Urban Bus Retrofit/Rebuild Program. Operators choosing to comply with Option 2 during 1995 and 1996 must use the PM levels as specified in the columns labeled ``Pre-rebuild PM level'' and ``Post-rebuild PM level'' in the table provided at 40 CFR Sec. 85.1403(c)(1)(iii)(A).