Why is the sky pink in the east during sunset occasionally?

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Why is the sky pink in the east during sunset occasionally?

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That’s called [the “venus belt”](https://www.atoptics.co.uk/fz527.htm) and what you’re seeing is the redder light from the sunset lighting up the atmosphere.

At sunset and sunrise, the sun’s light needs to travel further through the atmosphere. Generally speaking more light will “scatter”, and the blue end of the spectrum scatters first, leaving red and orange tones.

When there is smoke from fires in the air, the effect is magnified, as there are more particles in the air to scatter the light.

This is also true of other air pollution, so you often get orangey light in big cities (say Mumbai or Beijing).

I’m the middle of the day, sunlight does not travel as far through the Earth’s atmosphere, and the effect isn’t as pronounced.