What are temperature inversions?

A temperature inversion is when cold air stays near the ground and warm air sits on top of it, like a blanket trapping warmth above instead of letting it escape.

Imagine you're wearing your favorite snuggly pajamas on a chilly morning. You're cozy under the covers, but the room feels warm because the heater is blasting heat from above. That’s kind of what happens in a temperature inversion. Instead of warm air rising up and mixing with cooler air above, it stays put, like that warm heater, while colder air stays near the ground.

When this happens, you might notice strange things: smog hangs low over cities, or your breath doesn’t rise in the air, it just sits there. This is because the cold air acts like a lid, trapping pollution and making it harder for warm air to move up.

Think of a temperature inversion as a big, invisible blanket on top of a chilly room. The warm air is like the heater, it’s cozy and doesn’t want to go anywhere. The cold air is like you under the covers, it stays put, making everything feel extra chilly or smoky.