Cotton pollen grains are an important pollutant in which of the following cities?

The Bhopal gas tragedy in $1984$ was caused by the leakage of which gas?

Peroxy Acetyl Nitrate $(PAN)$,a class of hazardous air pollutants,stems from:
$I.$ $O_{2}$
$II.$ $SO_{x}$
$III.$ $NO_{x}$
$IV.$ $HC$

What significant event occurred on $1$ April $2010$ in the context of environmental regulations in India?

$A$ river with an inflow of domestic sewage rich in organic waste may result in

$A$ scrubber in the exhaust of a chemical industrial plant removes.......