Ground-level ozone is harmless.Stratospheric ozone is harmful to people.
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Q27: According to this figure, ultraviolet rays do
Q28: Oxygen is a greenhouse gas.
Q29: Which statement is not true of the
Q30: Temperatures in upper reaches of the thermosphere
Q31: Northern lights are also called aurora borealis.
Q33: Tropos in Greek means to turn over
Q34: Ozone molecules break apart naturally in the
Q35: PM10 is more unhealthy than PM2.5.
Q36: Most anthropogenic pollutants come from burning fossil
Q37: Most meteors burn up in the mesosphere.
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