Question

mountain regions are more peaceful and less polluted than the plains

Answer 1

HEY MATE.
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THE MOUNTAIN REGION ARE LESS POLLUTED BECAUSE THERE ARE PRESENT OF TREES,PLANTS.
BUT IN PLAINS THERE ARE SO MUCH POLLUTION AND THE POPULATION IS ALSO MORE THAN MOUNTAIN REGION.
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HOPE IT HELPS YOU
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Answer 2

People's avoid to live in mountainous regions. Thus mountian regions are not polluted much.in mountian there are trees in large number and animals too. Brids can live there, there chipping sounds make us very peaceful. But in plains tress are are cutting very fastly,birds doesn't get place to live. People live in large number thus it get polluted easily.

Hope my answer will help you.