According a report authored by M. J. Bradley & Associates (MJB&A) and published by the Natural
Resources Defense Council (NRDC), New York City Transit has reduced its emissions of particulate matter
(PM) by 97 percent and nitrous oxides (NOx) by 58 percent from 1995 levels. The reductions
were the result of the Clean Fuel Bus Program, which was initiated in 1995 in response to the Natural
Resources Defense Council's "Dump Dirty Diesels" Campaign.
NRDC contracted MJB&A to analyze the fleet emissions reductions achieved by the program from 1995 to
2006. The program included aggressive replacement and/or repowering of older buses, the
purchase and deployment of natural gas and hybrid-diesel electric buses, and retrofit of virtually the
entire diesel fleet with diesel particulate filters. For the analysis, MJB&A modeled the
annual bus fleet emissions of NOx and PM over a ten year period based on changing bus assignments,
annual mileage, and emissions factors (g/mi) by technology.
The success of the program has inspired other bus fleet operators in the US and around the world to make
similar changes to reduce emissions.
Natural Resources Defense Council
The Natural Resources Defense Council (NRDC) is a national, nonprofit organization of scientists,
lawyers and environmental specialists dedicated to protecting public health and the environment.
Founded in 1970, NRDC has 1.2 million members and online activists, served from offices in
New York, Washington, Chicago, Los Angeles, San Francisco and Beijing
.
New York City Transit
New York City Transit operates the largest subway car fleet in the world and more buses than any other
public agency in North America. Seven million people use NYC Transit services every day.
M.J. Bradley & Associates
M.J. Bradley & Associates (MJB&A) helps private and public sector clients understand and meet the
challenges posed by changes in environmental law and policy, energy markets and technology.
MJB&A has extensive expertise in managing transportation-related environmental projects, including
diesel retrofits, re-powering projects, hybridization, and electrification projects. The
company's core transportation-based competencies include: implementation of proof of concept
demonstrations, large-scale retrofit deployments, and emission testing programs.
