Skyglow in the sky

Could someone give me a brief explanation of what this glare is and how it actually happens? It seems to show up in red sometimes too. Thanks.

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So I was just reading that the apocalypse is actually happening! This is it, folks!
Whenever the sky gets all cloudy, if I look about 30 miles north of New York City, I can see this weird orange glow hanging out on the horizon.

Um... light pollution? 🤔

That’s just the glare from the neighborhood streetlights...