Environmental Impacts are changes in the natural or built environment, resulting directly from an activity that can have adverse effects on the air, land, water, fish, wildlife or the inhabitants of the ecosystem. Discus

Mass transit, as a result of the operations and maintenance of infrastructure, facilities, and vehicles, has numerous potential environmental impacts to manage, including air pollution and greenhouse gas from energy use, noise, and vibrations, water discharges, waste removal of passenger trash, harmful materials such as lead based paint, mercury, PCBs, asbestos, contaminated soil, and groundwater.