What can passengers do to enhance their comfort related to cabin atmosphere?

The correct choice is for passengers to notify the crew of discomfort related to temperature or air quality because it directly addresses the cabin environment issues that are important for comfort. Air quality and temperature control are crucial aspects of cabin atmosphere management, and flight attendants are trained to respond to passenger feedback regarding these issues. By informing the crew, passengers can initiate adjustments that might improve their comfort, such as modifying the cabin temperature or addressing air circulation problems.

Adjusting personal air vents can certainly help individual passengers regulate their immediate environment, but it may not adequately resolve broader air quality or temperature issues affecting the entire cabin. While requesting different meal options and changing flight seating arrangements might enhance comfort in a different context, they do not directly relate to the cabin atmosphere itself. In contrast, notifying the crew creates an opportunity for immediate action to improve conditions for all passengers.