Please answer fifth question

Dear Student,
5. ​​​​​Ozone gas, present in the atmosphere, protects us from rays of sunlight.
The ozone layer is a layer rich in ozone gas present in the earth's atmosphere. It lies between 10-40 km in the stratosphere layer of atmosphere. This layer absorbs most of the harmful UV radiation from the sun, thus protecting people on the earth.
6. Air, containing impurities, is called air pollutants. 
Oxides of sulphur (like SO2), nitrogen, carbon monoxide, heavy metals like Pb and Hg in the air and particulate matter are very well known air pollutants.
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