Which among the following pairs consists only of herbicides?

Arrange the following hydrocarbon fuels in increasing order of their polluting strength: $LPG$,$CNG$,and Kerosene.

The irritant red haze in traffic and congested places is due to the presence of which of the following?
$(i)$ Oxides of sulphur
$(ii)$ Oxides of nitrogen
$(iii)$ Carbon dioxide
$(iv)$ Mists,smoke and dust
$(v)$ Smog

The type of pollution that increases during the daytime and in the presence of $O_{3}$ is

Name the acids present in acid rain and state their sources in rainwater.

Which of the following is responsible for photochemical smog?