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Ozone is a colorless gas (O3) which is quite toxic near the ground. It can occur headaches and dyspnoea. It occurs in summer time, when the solar radiation leads to chemical reactions with other gases, mainly fumes. At higher altitudes ozone keeps the UV radiation from the earth and diminishes cancer and other diseases. At higher altitudes ozone is destroyed by chlorofluorocarbon.

Ozone in summer
Ozone in summer