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Which pollutant is released from the paddy fields ?


Methane.
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Name two non-biodegradable pollutants.

Pesticides (e.g. DDT) and plastic.
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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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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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