Marine ports in the United States are significant sources of pollution. They often contain huge ships that are running on very dirty fuel. Thousands of diesel trucks visit the ports daily and cargo diesel locomotives stop there as well. The pollution at marine ports can have extensive environmental impacts on neighboring communities. These impacts include increases in regional smog, decreased water quality, and increased risk of illness (e.g. respiratory and cancer). Marine ports are one of the most poorly regulated pollution sources in this country. This report focuses on answers to the problem of port pollution. It presents information, on the environmental and health impacts of port operations. In addition, it provides an overview of policies utilized in United States marine ports and presents in depth analysis and technical recommendations to regulatory agencies, port operators, and community-based health and environmental advocates.