Miami-Dade County (M-DC) has been pro-active in working to reduce diesel emissions.  In 2006, the county joined the Chicago Climate Exchange Program in order to track direct fuel emissions from government operations to identify the operations that use the most resources.  Miami-Dade County has implemented a number of projects since identifying these operations.

The county has used biodiesel at a blend of 5% for its fleet since April 2009.  Miami-Dade County has also implemented  hybrid vehicles.  32 Diesel-electric hybrid buses were in operation in 2010 with 62 planned for purchase as replacement vehicles by 2015.  In September of 2010, M-DC acquired its first hybrid hydraulic diesel waste collection vehicle with a plan of acquiring six by 2011.  Miami-Dade County has also been using Ultra-Low Sulfur Diesel long before it was federally mandated.

Through a National Clean Diesel Grant, M-DC has begun to repower 156 engines in agricultural irrigation pump sets, which should reduce the amount of diesel used per year by 357,053 gallons.

Miami-Dade County has undertaken a number of port projects as well.  In 2005, M-DC repowered diesel engines for five cranes as part of the Phase 1 Cargo Gantry Crane Electrification.  Two years later, the Port began using new electronic security gates which reduced truck idling time from 4 minutes to 90 seconds.  The port has also begun preparing for the widening of the Panama Canal in order to increase the capacity of the port and to reduce freight congestion and diesel emissions from local roads.  In this expansion process the port has taken on projects such as reconstructing its rail lines in order to link to the Hialeah intermodal rail yard terminal.  These projects are expected to take 6 million trucks off the road.