What does a higher density altitude indicate?

A higher density altitude is indicative of thinner air, which presents increased challenges for aircraft performance. When density altitude is high, the air is less dense, resulting in reduced performance concerning lift, engine power, and propeller efficiency.

As density altitude rises, an aircraft requires a longer takeoff distance and may experience longer climb rates due to diminished lift and engine performance in the thinner atmosphere. Pilots must be aware of the implications of high density altitude during flight operations, as it affects their ability to maneuver, safely clear obstacles, and perform adequately in various phases of flight.

The other options do not accurately represent the implications of higher density altitude. Higher density altitude does not improve engine performance nor does it correlate with less atmospheric pressure in a manner that benefits performance. Additionally, the effects of temperature are not lower; in fact, higher temperatures contribute to higher density altitudes, further complicating aircraft performance.