Climatological Atmospheric Dilution Indices

Atmospheric dilution indices (ADI) give an idea of the capacity of the atmosphere to disperse and dilute the pollutants emitted into it by myriad sources. The higher the index, the better is the dilution. In this paper, ADl has been computed on climatological bases for 20 stations spread all over India. With the help of isopleth analysis, the spatial distribution of these indices over India has been studied for 4 months, namely January, April, July, and October, which are typical of 4 seasons.