Why does sky looks more red during sunset than sunrise ?

Sunrise and sunset are the two phenomena where Sun is near the horizon . Everyone knows during sunrise and sunset , sky turns red or orange colour which is the mixure of red and yellow colour . My doubt is why sky looks more red during sunset than sunrise ? Before explaining this , I would like to tell some facts . Visible light is made of 7 colours which are violet , indigo , blue , green , yellow , orange and red . The wavelength of red colour is longer than violet colour . Now , the light from the Sun gets scattered before reaching the observer . Now when Sun is near the horizon , scattering is more . Because of this , light components of shorter wavelengths are virtually removed ( violet colour and others ) and only light components of longer wavelengths( yellow to red ) reach the observer . Hence , sky looks dark red or orange during sunrise and sunset when Sun is near the horizon . Let's come back to question . Why does the sky looks more red during sunset than sunrise? As I said earlier , light gets scattered throughout the atmosphere . During morning , dust particles and pollution are less . As day passes , the amount gets added up . During evening , scattering of light components is more . Scattering is more meaning more rays of longer wavelengths like red , orange and yellow colour . That's why sky looks more red during sunset than sunrise .