Blue colour of the sky is due to
Blue colour of the sky is due to scattering of light. The two most common types of matter present in the atmosphere are gaseous nitrogen and oxygen. These particles are most effective in scattering the higher frequency and shorter wavelength portions of the visible light spectrum. The amount of multidirectional scattering that occurs is dependent upon the frequency of the light. So as white light from the sun passes through our atmosphere, the high frequencies become scattered by atmospheric particles while the lower frequencies are most likely to pass through the atmosphere without a significant alteration in their direction. Compared to blue light, violet light is most easily scattered by atmospheric particles. However, our eyes are more sensitive to light with blue frequencies. Thus, we view the skies as being blue in color.