The ozone layer sits near the top of earth's atmosphere and protects us from the sun's harmful ultraviolet rays. but ozone is dangerous when it's closer to ground level. which of the following describes ozone?
a fibrous mineral used to insulate and fireproof buildings and home appliances that can cause lung cancer when inhaled
a radioactive gas that can enter a house through its foundation and produce indoor pollution that can cause lung cancer
a product of a reaction between nitrogen oxides and volatile organic compounds present in various emissions that can irritate respiratory organs

The correct answer is:   [C]:

          " a product of a reaction between nitrogen oxides and volatile organic compounds present in various emissions that can irritate respiratory organs " .

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