The photochemical smog contains PAN and ozone.

The satements that are TRUE:
(A) Methane leads to both global warming and photochemical smog
(B) Methane is generated from paddy fields
(C) Methane is a stronger global warming gas than ${\mathrm{CO}}_2$
(D) Methane is a part of reducing smog

Choose the most appropriate answer from the options given below:

The incorrect statement(s) among (a) – (d) regarding acid rain is (are):

a) It can corrode water pipes

(b) It can damage structures made up of stone.

(c) It cannot cause respiratory ailments in animals

(d) It is not harmful for trees

Match the following.