California Air Resources Board

Construction equipment is a major contributor to air pollution, especially when large construction projects are adjacent to neighborhoods. To address this source of air pollution, the California Air Resources Board adopted the nation's first regulation aimed at cleaning up ‘off-road’ construction equipment such as bulldozers, graders, and backhoes. Starting in 2007, these requirements ensured that diesel soot filters were installed on these powerful machines, and with the help of incentives and grants some owners and companies can replace the oldest and dirtiest equipment with new, cleaner models.