What environmental factors contribute to a Higher Density Altitude?

Higher density altitude is influenced primarily by atmospheric conditions that affect air density. The correct choice highlights two key factors: higher elevations and higher temperatures.

At higher elevations, the atmospheric pressure decreases, which in turn reduces air density. This means that for a given height, the air is less dense as altitude increases. Additionally, higher temperatures contribute to an increase in density altitude because warm air is less dense than cold air. When temperatures rise, the air expands and occupies a larger volume, leading to lower density. Thus, at higher elevations combined with higher temperatures, the density altitude is significantly increased, which can greatly impact aircraft performance by reducing engine efficiency, lift, and overall performance.

The other factors listed, such as humidity and wind conditions, do play roles in aviation but are not the primary contributors to density altitude in the way that elevation and temperature are.