The chemicals in car exhaust get into the air and cause pollution. Criegees are chemicals that form when car exhaust comes into contact with ozone in the air. Some kinds of air pollution can be caused by Criegees.
Places where it is hot and dry, like a desert, have more pollution caused by Criegees. There is less water vapor in the air when it is dry. Hotter air can make more liquid water turn to vapor, but Criegees don't chemically react with water vapor in hot air. This is because Criegees only like water molecules that bind together with another water molecule. These are called water dimers. In hot air, there are less water dimers for Criegees to react with.
When it is cold and wet, like during a blizzard, less pollution is made by Criegees. This is because the Criegees chemically react with water vapor in the air to form other chemicals. That means when there is more water vapor, there are less Criegees that can make air pollution chemicals. Criegees also react faster with water when it is cold.
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