Which feature is part of the passenger service unit (PSU) on the ERJ 175?

The passenger service unit (PSU) on the ERJ 175 is designed to enhance passenger comfort and safety during flight, and one of its key features is individual air control. This feature allows each passenger to adjust the airflow to their preference, providing a personalized environment. Individual air control is crucial in managing personal comfort, especially during long flights or varying cabin temperatures.

In contrast, the other options do not belong to the PSU. The overhead baggage compartment is a separate structure for the storage of carry-on luggage and is not part of the passenger service unit itself. Disability seating refers to designated spaces designed for passengers with specific needs, which is part of the seating arrangement rather than the PSU. Emergency exit path lighting is a safety feature located along the exit paths, but it does not fall under the PSU classification. Thus, individual air control stands out as a vital and correct element of the PSU on the ERJ 175.