Why does it feel fresh when the weather is cold?

In summer, whenever it rains, people often feel that the weather is cool and the air is fresh. Why is this?

Before it rains, on the one hand, it is because the water vapor in the air increases and the air pressure decreases, which makes people feel stuffy; On the other hand, rain is caused by the meeting of cold and warm air, which is often warm air in front and cold air behind, so the temperature is higher before rain. When it rains, water vapor condenses into water droplets to absorb some heat. After the rain stops, the warm air has passed, and the cold air should move over, so people will feel cooler.

Usually, there are a lot of dust impurities in the sky. When it rains, these dust impurities play the role of condensation nuclei for water vapor in the air, and the water vapor adheres to it and becomes large water droplets and falls to the ground. When raindrops fall, dust and impurities in the lower air will also attach to them and fall together. If you hold some rainwater in a basin and let it settle, you will see some tiny grains of sand at the bottom of the basin, which is why. Therefore, the next rain seems to give the sky a general cleaning, which will naturally make people feel that the air is particularly fresh.