Final answer:
The exhaust pipe of a diesel engine must be connected to the shop exhaust system to protect against breathing harmful emissions.
Step-by-step explanation:
The exhaust pipe of a diesel engine must be connected to the shop exhaust system to protect against breathing harmful emissions.
Diesel engines emit various harmful materials, such as carbon monoxide, nitrogen oxides and particulate matter.
These emissions can be harmful to both human health and the environment.
By connecting the exhaust pipe to the shop exhaust system, these harmful emissions can be safely removed and filtered before being released into the atmosphere.