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None of the Earth's oxygen is polluted. Oxygen is an element and, if it is present, is in its pure form. Areas of the Earth's atmosphere (a mixture of about 21% oxygen, 78% nitrogen and 1% argon along with traces f other gases) may contain local concentrations of pollutants.)

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Which is the approximate percentage by volume of oxygen present in earths atmosphere at location 2?

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What percentage of people get sick from polluted water in the US?

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