noun
inversion layer
Meteorological term for a layer of the atmosphere where temperature increases with altitude, trapping pollutants and affecting weather.
逆転層ができると、大気汚染が悪化しやすい。
When an inversion layer forms, air pollution tends to worsen.
Compound of 逆転 (gyakuten, 'reversal') and 層 (sō, 'layer'), referring to a layer where the normal temperature gradient is reversed.