Winter smog
Winter is here, and the air is nice and fresh. Yet on some days it’s harder to breathe because of winter smog. Air is colder higher up You probably already know that temperatures usually decrease with altitude. Just think of snow-capped mountains! So the higher you go, the colder it gets. In these conditions, smoke from a chimney tends to rise vertically. This smoke rises because it’s warmer and lighter than the surrounding air, and the smoke can disperse at a higher altitude.
