CE-CERT has been investigating port emissions since 2003, first from locomotives and later drayage vehicles and equipment. More recently the Center has also studied emissions from harbor craft, ferries and ocean-going vessels. Massive port facilities use diesel power to load and unload container ships, as well as to move cargo in and out of the area. The twin Ports of Los Angeles and Long Beach are among the largest contributors to air pollution in the South Coast Basin. The Emissions and Fuels Research Group has developed some of the earliest comprehensive emissions profiles of different ocean-going vessel engine designs and fuels. The center also was a partner on the first study of lower sulfur marine fuels in the Gulf of Mexico by the U.S. EPA and the Mexican Federal Government. Studies have also evaluated hybrid technologies for drayage vehicles and harbor craft.