What is the phenomenon in which smoke hangs low to the ground on a calm cool damp day?

The phenomenon where smoke hangs low to the ground on a calm, cool, damp day is referred to as smoke inversion. This occurs when a layer of cool air at the surface is trapped by a layer of warmer air above, preventing the smoke from dispersing and allowing it to settle closer to the ground. The combination of calm winds and higher humidity on such days contributes to the stability of the atmosphere, further hindering the vertical movement of air and smoke.

This phenomenon can lead to reduced visibility and increased pollution levels, as the smoke remains concentrated in a limited area, which can have health implications for individuals with respiratory issues. Understanding smoke inversion is crucial for firefighters and emergency responders, as it influences firefighting tactics and safety measures during incidents involving smoke or hazardous materials.