The EPA has failed to produce meaningful standards for controlling emissions from Category 3 marine diesel engines -- engines that power the largest oceangoing vessels such as tankers, freighters and cruise ships -- as required by the Clean Air Act. These marine engines burn residual fuel oil which contains sulfur, nitrogen, ash, and other substances that turn into sulfur oxide, nitrous oxide, and other pollutants and greenhouse gases when burned. Typical of shipping practices across the country, the ships steam into ports -- sometimes for days awaiting their turn to dock -- all the while running their engines to generate electricity to operate various ship systems (a practice called "hotelling"). People who live near ports are exposed to higher levels of diesel particulate matter and other pollutants, and suffer higher rates of asthma and cardiovascular disease.

Earthjustice sued EPA to compel the agency to set meaningful emissions standards for this significant source of air pollution.  EPA has committed to issuing regulations by December 17, 2009.