Coronavirus (COVID-19) adds a new element to Fick's first law for calculating the dispersion coefficient, by adding or subtracting aircraft velocity and the rest of the transport tools to water velocity or wind.
The prevalence of pollutants, including viruses, in air and water environments, is calculated according to the Fick's law (D = the speed of the carrier, whether air or water or the speed of transportation of passengers multiplied by the concentration of viruses (their number per unit of volume).
Humans are currently moving from one place to another at a speed that exceeds the speed of the wind and the water carrying pollutants, which are most likely to be their final precipitation site towards the seas and oceans, while on the other hand, the human movement is within the land continents.