Ozone is a gas that occurs both in the Earth's upper atmosphere and at ground level. Ozone can be good or bad for your health and the environment, depending on its location in the atmosphere. Ozone occurs in two layers of the atmosphere. The layer closest to the Earth's surface is the troposphere.
Description & Range: The chimney swift is a small bird with a slender body and very long, narrow, curved wings. They have small round heads, short necks, and short, tapered bill. They can grow to sizes of 5.9 inches in length with an 11.8 inch wingspan and can weigh up to 1.1 ounces. Chimney Swifts are dark-gray brown all over with lighter plumage on their neck.
A chimney installed on the outside wall of a house and serving a basement installation is most susceptible to backdrafting caused by the stack effect. At standby (no fire in the appliance), the air in the flue can cool to outside temperature.With no temperature difference, no draft is produced in the chimney, and the minor negative pressure acting on the air inlets of the appliance can readily cause reverse flow in the chimney.Backdrafting at standby is clear evidence of the stack effect in buildings. chimney installed on the outside wall of a house and serving a basement installation is most susceptible to backdrafting caused by the stack effect. At standby (no fire in the appliance), the air in the flue can cool to outside temperature.