The sky appears pink due to a phenomenon called scattering. When the sun is low on the horizon during sunrise or sunset, its light passes through more of the Earth’s atmosphere. The shorter blue and violet wavelengths scatter out of view, leaving the longer red, orange, and pink wavelengths to dominate the sky.
This effect is enhanced by the presence of particles like dust, pollution, or water droplets in the atmosphere, which further scatter the light and intensify the pink hues. The result is a stunning pink sky that captivates observers during these times of the day.