Which of the following led to problems like waterlogging and soil salinity?

An electrostatic precipitator is used in thermal power plants to remove $...........$ from the exhaust gases.

Which of the following is a secondary air pollutant?

Discuss briefly the following:
$(a)$ Greenhouse gases
$(b)$ Catalytic converter
$(c)$ Ultraviolet $B$

Water logging and soil salinity are some of the problems that have come in the wake of the Green Revolution. Discuss their causes and adverse effects to the environment.

Electrostatic Precipitator $(ESP)$:
$I.$ Is an electrical device to remove particulate matter present in the exhaust of thermal power plant.
$II.$ More than $99\, \%$ particulate matter can be removed by this method.
$III.$ $ESP$ has electrode wires and a stage of collecting plates.
Which of the statements given above are correct?