Cummins Inc. unveiled its complete product portfolio for the transit bus market — diesel, diesel-electric hybrid and natural gas engines designed to meet the 2013 U.S. Environmental Protection Agency (EPA) emissions regulations and new greenhouse gas (GHG) and fuel-efficiency standards — at EXPO 2011 on Monday.

The EPA 2013 emissions regulations call for all on-highway engines to be equipped with On-Board Diagnostics (OBD), which monitors emissions-related engine systems and components and alerts the operator of malfunctions. It is also designed to further enhance the engine and operating system by providing early detection of emissions-related faults.  

New regulations for 2014 have recently been finalized by the EPA and the U.S. Department of Transportation, instituting equivalent carbon dioxide (CO₂) and fuel-efficiency standards. By burning less fuel in the engine, CO₂ is simultaneously reduced.

Cummins GM, worldwide bus business, Tom Hodek said the company will meet the OBD as well as the GHG and fuel-efficiency requirements by Jan. 1, 2013, on Monday morning.