The Law of Lognormal Distribution of Air Pollutant Concentrations (I)

Abstract

The ambient air pollutant concentrations are known empirically to be longnormally distributed for any averaging time and frequency. The law of lognormal distribution of air pollutant concentrations are examined in the case of isolated point source, assuming that spatial concentrations of air pollutants are described by the Gaussian plume model.
The results show that the air pollutant concentrations are lognormally distributed at any receptor, and the parameter of the distribution can be estimated by the parameter of the distribution of the wind velocitiEs and the wind directions at the point source and by the distance from the point source to the receptor.