The Metropolitan Transportation Authority, Capital Construction Company in New York is managing the construction of two projects in Lower Manhattan, funded via federal government post-9/11 recovery allocations. Lower Manhattan is one of the largest business districts in the nation, and the two projects — the South Ferry Terminal Station and the Fulton Street Transit Center — will improve transit access to, and help to revitalize downtown Manhattan. With dozens of large-scale projects in the planning and construction stages in Lower Manhattan, many having lengthy and overlapping construction periods, MTA CC has aggressively implemented Environmental Performance Commitments (EPCs), developed in conjunction with other agencies building in Lower Manhattan. Heightened community awareness of air quality issues in Lower Manhattan has made the clean diesel emissions program one of the most important of the EPCs to implement. The U.S. EPA is using MTA CC's clean diesel emissions program as a model of success to induce its implementation in other areas of the country. The clean diesel emissions program includes use of Ultra Low Sulfur Diesel (ULSD) fuel, use of Tier 2 engines and diesel particulate filters (DPF) on all off-road construction engines of 50 horsepower (hp) or greater. MTA CC worked closely with retrofit vendors, equipment/engine dealers, rental agencies, and contractors to implement and manage this program. Between the two projects almost 150 pieces of equipment have been eligible for the retrofit technology and an approximate 86 percent compliance rate has been maintained. Given that these measures reduce particulate matter emissions by more than 90 percent, and that construction diesel equipment is a significant contributor to poor air quality, the program provides significant air quality benefits to Lower Manhattan.