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Ozone is found both in the upper

atmosphere and at ground level.

The ozone occurring in the upper

atmosphere (10-30 miles above the

earth's surface) is considered good

ozone because it helps to block the

Sun's ultraviolet rays.

Ozone occurring near the Earth's

surface is considered bad because it is

made of pollutants resulting from car

emissions, aerosols, factories,

refineries, chemical plants and boilers.

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14y ago

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