Electric forklifts are relatively quiet and have no fumes.
Try to assure yourself of the condition prior to purchase. This can be done by having a warranty on the components, or have a reputable forklift service inspect the motors and take a capacity test on the battery. Some forklift motors are easier to inspect than others. Electric forklifts are typically used in the food industry and in warehouses where aisle spacing is critical. Propane forklifts have an engine and, as a result, generate some level of fumes.