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https://en.wikipedia.org/wiki/Outline_of_air_pollution_dispersion

copied from outline of air pollution dispersion

Described trends seen in Pasquill's stability classes and clarified bounds for strong, moderate, and slight solar radiation in table 2:

Pasquill atmospheric stability classes – oldest and, for a great many years, the most commonly used method of categorizing the amount of atmospheric turbulence present was the method developed by Pasquill in 1961. He categorized the atmospheric turbulence into six stability classes named A, B, C, D, E and F with class A being the most unstable or most turbulent class, and class F the most stable or least turbulent class. Table 1 lists the six classes and Table 2 provides the meteorological conditions that define each class. The stability classes demonstrate a few key ideas. Solar radiation increases atmospheric instability through warming of the Earth's surface so that warm, less dense air is below cooler, denser air promoting vertical mixing. Clear nights push conditions toward stable as the ground cools faster establishing more stable conditions and inversions. Wind increases vertical mixing, breaking down any type of stratification and pushing the stability class towards neutral (D).

Incoming solar radiation is based on the following: strong (> 700 W m-2), moderate (350-700 W m-2), slight (< 350 W m-2)