From an air quality and climate pollutant standpoint, the state of California has the cleanest ports in the U.S. The success of these ports’ clean air programs is a function of numerous factors. They include port policies, lease agreements, voluntary measures, regulations and an industry willingness to experiment with a variety of technologies, fuels and operational modifications. Most port-related emission categories are now measured in fractions of a percentage point of total emission inventories – i.e., very small numbers. As an example, nitrogen oxide (NOx) emissions for marine terminal equipment operating in the South Coast Air Basin make up about…