Density altitude inputs include which parameter?

• A. Humidity
• B. Wind speed
• C. Cloud cover
• D. Barometric pressure

Answer: (D)

Density altitude reflects how dense the air is compared to the atmosphere at a given altitude. The key factor that sets air density in these calculations is barometric pressure. Higher pressure makes air denser, which lowers the density altitude, while lower pressure makes air less dense and raises the density altitude. Temperature also plays a role (warmer air is less dense), but barometric pressure is the core input that directly ties to air density in this context. Wind speed and cloud cover don’t change air density, so they don’t affect density altitude. Humidity does affect density in reality, but in many practice questions the emphasis is on barometric pressure as the defining input.