Air stagnation is a phenomenon which occurs when an air mass remains over an area for an extended period. Stagnation events strongly correlates with poor air quality. Due to light winds and lack of precipitation, pollutants cannot be cleared from the air, either gaseous (such as ozone) or particulate (such as soot or dust).
Air stagnation is a situation where an air mass remains stationary over a region for a long time. Stagnant episodes are often associated with poor air quality. The absence of wind and precipitation hinders the removal of pollutants from the atmosphere, including gases like ozone and particulate matter such as soot or dust.