Note: This information is provided for reference purposes only. Although the information provided here was accurate and current when first created, it is now outdated.

Heavy-duty engines (trucks, buses, and non-road equipment) contribute 59% of the oxides of nitrogen (NOx) emissions and 82% of the particulate matter (PM-10) emissions from mobile sources nationally (Fig. 9). In the Northeast, heavy duty engines account for approximately 20- 30% of total NOx emissions. Given these significant emissions, strategies to control pollution from heavy duty engines are critical if we are to improve the quality of our air. EPA, working with the California Air Resources Board and leading national manufacturers of heavy duty engines, is meeting this challenge through a national initiative to reduce emissions from new trucks and buses substantially. This initiative will identify effective strategies for further reducing pollution from heavy duty engines. The goal of this initiative is for engine manufactures to produce engines that emit only half as much NOX as current engines by model year 2004. Here in New England, EPA is working with private companies and public agencies to demonstrate innovative technologies for reducing pollution from heavy duty engines. One such project, at Logan International Airport, is demonstrating the benefits of bio-diesel fuel and compressed natural gas in a variety of passenger service vehicles. This project is a showcase for what one facility -- New England's gateway airport -- can do to reduce pollution from heavy duty engines.