:: Section 9
Visibility Effect of Atmospheric Aerosol
I. Light Extinction
The extinction (including scattering and absorption) of light is given by Bouguer's law (also known as Lambert-Beer law):
I0 = incident light intensity; I = light intensity traversing the aerosol; σ
The following animation shows the process of light extinction by aerosols.
For a monodisperse aerosol, the extinction coefficient is:
N = particle concentration (number per unit volume); A
For polydisperse aerosols, the above equation holds for each particle size, and the combined effect is given by the sum of the extinction coefficients for all the particle sizes.