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What is ozone?

Ozone is a colorless gas composed of three atoms of oxygen. Ozone occurs both in the Earth’s upper atmosphere and at ground level. Ozone can be good or bad, depending on where it is found:

Good Ozone. Ozone occurs naturally in the Earth’s upper atmosphere-10 to 30 miles above the Earth’s surface-where it forms a protective layer that shields us from the sun’s harmful ultraviolet rays. This “good” ozone is gradually being destroyed by manmade chemicals. An area where ozone has been most significantly depleted-for example, over the North or South pole-is sometimes called a “hole in the ozone.”

Mexico City has the world’s worst levels of smog. As a result, children and the elderly are advised not to live in the city. The heavy smog levels have had serious health effects in the city, though many poorer people who need city jobs have to live there and suffer from the smog.