How far air pollutants are transported primarily depends on the size of compounds and the height at which the pollution was emitted into the air. Fumes emitted into air through high smoke mixes with air maintaining the local concentrations. However, wind transports compounds making the pollution disperse. Rain removes pollutants from the air causing precipitation and consequentially soil and water pollution.
We can predict the dispersion of air pollutants very easily with the computer models as air is not a very complex medium. A computer model calculates by different parameters such as wind direction, wind speed, humidity, cloudiness and temperature. These predictions are of great value when toxic clouds are taken into consideration as they are a danger to human health.