Prop 65 at the Loading Dock: When Diesel Exhaust Warnings May Apply

Frequently Asked Questions

Do I need a Prop 65 diesel exhaust warning at my loading dock?

Maybe. It depends on the exposure scenario, who is being exposed, how routine the exposure is, and whether diesel exhaust is a predictable part of the dock or yard environment.

Does posting a Prop 65 warning sign replace Cal/OSHA controls for diesel exhaust?

No. The post explains that Prop 65 warnings and Cal/OSHA exposure controls are separate duties, so a sign does not replace ventilation, anti-idling, traffic separation, or other controls.

Where does diesel exhaust exposure usually come from in warehouse operations?

It often comes from cumulative activity such as idling road trucks, yard trucks, diesel forklifts, refrigerated trailers, and queued vehicles near docks, staging lanes, and inspection areas. The risk is higher where airflow is poor, engines idle for long periods, and employees spend hours near emission sources.

What should we review before deciding whether a Prop 65 warning is needed?

The post recommends a documented site review that maps exposure areas, lists emission sources, reviews time and proximity, checks controls, and coordinates EHS and legal review. It also says to document the basis for your decision and place any warning where affected people actually encounter the exposure area.

If respirators are being considered for diesel exhaust, what does Cal/OSHA expect?

Respirators are not the first step. The post says employers should first look at feasible engineering and administrative controls, and if respiratory protection is needed, they should not skip required program elements such as hazard evaluation, respirator selection, medical evaluation, fit testing, and training.