Definition
A reduction in visibility caused by fine particles of dust, smoke, or moisture suspended in the atmosphere, which scatter light and obscure distant objects. Haze creates an illusion of being at a greater distance from the runway, leading pilots to fly a lower approach than normal.
Plain English
A thin, dry murkiness in the air that makes things farther away look fainter and harder to see clearly. On approach, this can trick a pilot into thinking the runway is farther away than it really is.
Context Anchor
Encountered during visual approaches, landing, and instrument training discussions about optical illusions.
Derivation
Haze' comes from older English, originally meaning a misty or obscured state of the air. The aviation use keeps that everyday sense but ties it to a specific visual problem: distance is harder to judge when contrast is washed out.
Why Pilots Care
Haze can cause a pilot to fly a lower-than-intended approach or misjudge runway distance, increasing the risk of an unstabilized landing or controlled flight into terrain.
Analogy
It is like looking at a building through a dirty window: the building is still there, but it looks faded and may seem farther away than it really is.
Grounding Statement
On a hazy day, the runway can look washed out even when the airplane is closer to it than it appears.
Intuition Check
Atmospheric haze is not just “bad visibility.” In this context, the important point is that it can change how distance and height look to the pilot.
Example Sentence 1
On the approach into the valley, atmospheric haze made the runway look distant, so the pilot consciously flew the glidepath on instruments rather than trusting the view outside.
Example Sentence 2
The atmospheric haze erased the horizon line over the water, causing a slow, unnoticed descent toward the surface.