The major source of workplace exposure to diesel exhaust is from heavy vehicles that use diesel fuel like trucks, buses, trains, tractors, ships, bulldozers and fork lift trucks.
Other sources include equipment in mines, bucket lifts and excavators.
All motor vehicles that use diesel fuel generate diesel exhaust when running including during workshop repair or servicing, in car parks, when passing toll booths or in vehicle holds in ships and trains.
Stationary power sources like generators and winch motors may also generate diesel exhaust.
There is a greater risk of exposure in enclosed, poorly ventilated areas where the concentration of exhaust can build up such as in vehicle repair workshops, tunnels, partially covered roadways and walkways.
Safe Work Australia publishes Guidance for managing the risks of diesel exhaust.