Clean Construction USA, part of the National Clean Diesel Campaign (NCDC), is a voluntary program designed to promote the reduction of diesel emissions from construction equipment and vehicles.

Nonroad diesel engines can contribute significantly to the levels of particulate matter (PM) and nitrogen oxides (NOx) in the air. In recent years, EPA has set emissions standards for engines used in most new construction equipment. However, because construction equipment can last 25 to 30 years, it will take many years before existing equipment is replaced with new, cleaner equipment. Because EPA's regulations only apply to newly manufactured diesel engines, EPA developed the Clean Construction USA program to assist owners and operators of construction equipment to reduce emissions from the older engines that are in operation today.

Clean Construction USA is encouraging contractors, owners, and operators of construction equipment to:

• properly maintain their equipment,
• reduce idling,
• retrofit diesel engines with verified technologies,
• replace older equipment,
• use cleaner fuels,
• repower equipment (i.e. replace older engines with newer, cleaner engines).