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16 September, 02:15

Which gas is not a source of air pollution? a) nitrogen oxide b) carbon dioxide c) sulfur dioxide d) carbon monoxide

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  1. 16 September, 03:07
    0
    A. nitrogen oxide

    or c. sulfur dioxide
  2. 16 September, 05:23
    0
    It's b) your answer: 'carbon dioxide' is not a source of air pollution. Moreover, plants are a continuous source of carbon dioxide in our atmosphere.
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