Ventilation Index (VI) 2
Ventilation Index (VI) 2 : A term commonly used in air pollution meteorology. The VI is a numerical value relating to the potential of the atmosphere to disperse airborne pollutants from a stationary source (e.g. smoke from a prescribed fire). It is calculated by multiplying the mixing height by the average wind speed in the mixed layer. (In British Columbia's 1986 smoke management program, the resultant product was converted to a scale from 0 to 100. Five VI classes, accompanied by descriptive terms ranging from poor to excellent dispersion, were defined for use in operational forecasting)
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