I read that ozone gas has a blue color to it. Is that why the ski is blue when the sun comes through?

Answer 1

no, ozone is present in far too low a concentration for that to be the cause of the blue color of the sky. actually what happens is the sunlight is scattered (not absorbed) by gas molecules and dust in the atmosphere. scattering depends on the wavelength of light and the size of the particles - blue light is scattered more than red. so the sky appears blue, and the sun can appear red when the light has to travel through a lot of atmosphere (i.e. at dawn and dusk).

Answer 2

The sun's rays hit the Earth's atmosphere, where the light is scattered by nitrogen and oxygen molecules in the air. The blue wavelength of this light is affected more than the red and green wavelengths, causing the surrounding air to appear blue. At sunset, the sun's light passes farther through the atmosphere, deflecting and decreasing the blue in the air. Scattering by dust particles and pollution in the air causes the sunset to appear red.