Effective 14 October 1997, Nelson Industries received EPA certification under the Urban Bus Rebuild Retrofit program. The certified equipment is a catalytic exhaust muffler (Nelson converter), packaged as a direct replacement for the muffler. The OCM provides 25% or greater reduction in exhaust emissions of particulate matter (PM) for Detroit Diesel Corporation (DDC) two stroke cycle engines originally installed in urban buses from model year 1979 to model year 1993 excluding the DDC 6L71TA 1990 model year engines, all alcohol fueled engines, and models which were manufactured with particulate trap devices.

For information contact: Tom Stricker, Engine Compliance Programs Group, Engine Program and Compliance Division (6403J), US Environmental Protection Agency, 401 M St. SW, Washington, D.C. 20460. Telephone: (202) 564-9322.