Why sky blue   Sunlight scattered by gases with very negligible intensity because according to Rayleigh scattering particles range between  and  nanometers are trillion times more intense than gases  nitrogen  oxygen  and much less intense than haze  about  nanometers  On the other side tiny particles and haze appear white in cold weather which means that atmospheric blue color is Rayleigh scattering independent   It is more easy to explain in my mother language as shown in this link  httpwwwkabelfeesnetSkySkycolorisunknownhtm   that ozone layer reflects oceans color