在氣溶膠物理學中,沉降是指氣溶膠粒子聚集或沉積在固體表面上,從而降低空氣中粒子濃度的過程。沉降時依據是否有降水可以分為兩類,分別為干沉降濕沉降。如果大氣中的氣溶膠粒子是被雨、雪、露、霜等降水物質帶到地面上,那麼這個過程則被稱為濕沉降,若沒有受到降水作用而落到地面則為乾沉降[1][2][3]

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