Stability Class 1
Stability Class 1 : A category characterizing the degree of stability, or absence of turbulence, in the atmosphere. The classification used for regulatory models and methods for estimating the appropriate stability category from other meteorological data are given by EPA (1987). The least stable category is class A, in which the high level of turbulence causes air pollutants from any particular source to mix rapidly with surrounding air, thereby reducing pollutant concentrations. The most stable category is class F, in which pollutants are not well mixed but remain in relatively high concentrations within a smaller volume. Sometimes a seventh category (i.e., G, or extremely stable) is used to represent extremely stagnant conditions
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