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    Environmental Issues
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    Which pollutant is released from the paddy fields ?
    Methane.
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    What are secondary pollutants ? Give two examples.

    Pollutants formed by reaction between the primary pollutants in the atmosphere. e.g. ozone.
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    What according to the CPCB causes greatest harm to the human health ?

    Particulate size 2.5 micrometers
    or less in diameter (PM 2.5)

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    What are Dobson units ?
    Dobson units is the unit for measuring the thickness of ozone in a column of air from ground to top of atmosphere.
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    Name two non-biodegradable pollutants.
    Pesticides (e.g. DDT) and plastic.
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