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.
Make sure there is a cricket if the chimney is 30 inches wide or more. If the chimney is narrow (less than 30 inches wide) and there is no cricket, make sure that the cap flashing on the top side of the chimney extends high enough up the chimney and up the roof. cricket or saddle is typical on a chimney and is required by many authorities when the chimney width is more than 30 inches. The cricket or saddle is a peak that deflects water and snow around the chimney, preventing it from accumulating against the top side of the chimney.