There are many types of air present in our atmosphere. The first type is known as dry air. Dry air is described as having less than 1% of moisture in it. The best location to find this type of air is in the Southwest part of the United States and also in the Middle East.
The second type of air is called moist air. This air is best defined as having moisture present in it. Anything greater than 1% would be described as being moist. The best places to find this type of air is along the Southeast part of the United States due to the moisture from the Gulf of Mexico.
The third type of air is known as cold air which is found anywhere behind a cold front. When a cold front moves through an area the temps rapidly drop especially during the late fall and early spring when the air in Canada is very cold.
The fourth type of air is warm air which is best found behind a warm front. When a warm front moves through an area the temps will gradually warm from the South to the North.