Which meteorological condition is present when haze or fog is observed low over the field with air movement, and the air temperature is warmer at ferry flight level than at ground level?

The correct answer is temperature inversion, and this phenomenon has specific characteristics that align perfectly with the scenario described. In a temperature inversion, a layer of warm air traps cooler air near the surface. This results in conditions where the air temperature is warmer at higher altitudes, such as the ferry flight level, compared to the cooler air at ground level.

When visibility issues such as haze or fog are present, it suggests that there is a buildup of moisture or particulate matter, which is typical in inversion conditions because the stable layer of warm air above prevents the cooler air from mixing with the air above it. This can lead to persistent low-level clouds, fog, or haze, making visibility limited.

Understanding that this situation occurs during a temperature inversion helps in managing aerial applications, as the stability of the air layers can impact pesticide dispersion, making it paramount for operators to be aware of and assess such conditions before proceeding with flights.