# Why the 'low' part of the sky looks lite blue?

When looking on the sky its lower part looks lite blue instead blue like the rest of the sky. Why is it so?

• I wouldn't close this as a duplicate of the proposed question; that one doesn't ask about (or explain) phenomena near the horizon. Jun 24, 2021 at 17:29
• I agree. The proposed duplicate addresses similar principles but it is not the same as this question. Jun 27, 2021 at 8:38
• The answer to this question is here physics.stackexchange.com/questions/561101/… and the answers there specifically discuss the whiteness of the sky closer to the horizon. Jun 27, 2021 at 10:02

When you look in different directions you look through different amounts of air (and different layers): the total distance scales as $$\approx 1+\tan^2(\theta)$$ where $$\theta$$ is the zenith angle.