Question: Two serious environmental problems have received considerable attention over the past three decades: (a) The serious depletion of ozone in the Earth's stratosphere, especially over

Two serious environmental problems have received considerable attention over the past three decades:

(a) The serious depletion of ozone in the Earth's stratosphere, especially over the North and South Poles. How has this depletion occurred, and why does it present a serious health problem?

(b) The serious buildup of ozone in the big cities due to air pollution. How has this buildup occurred and why does it present a serious health problem?

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