The supersonic jets cause pollution by the thinning of
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The true statement about ‘green house effect’ is that it is
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Mobile combustion accounts
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Air pollution can be of
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Which of the following is a secondary pollutant
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Fine organic or inorganic particles suspended in air is called
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All are particulate pollutants except
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Particulate pollutants are
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Air pollution is severe in
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According to EPA of USA, the following is not one of the six major pollutants?
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The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.
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Ringelmann chart No. 2 corresponds to __________ percent black smoke.
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