What would cause orange skies?

I'm starting a whole new planet for a story and would like it to have an orange sky during the day.

At a basic level (I am not a smart man) what chemical composition would be most conducive to Orange sky colouring? What colour would that appear during sunrise/sunset (Our blue turns orange due to some science magic, what effect would this same process have on an Orange atmosphere?

The air doesn't have to be breathable, I am fine with whatever implications this will have on human characters re: Breathing gear, space suits, etc.

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What would cause orange skies?

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