The $Taj \ Mahal$ is threatened by pollution from:

Identify the true $(T)$ and false $(F)$ statements regarding the disease known as fluorosis:
$(1)$ Fluorosis weakens teeth and bones.
$(2)$ Fluorosis is caused by fluoride concentrations greater than $2 \ ppm$ $(2 \ mg/L)$.
$(3)$ Fluorosis causes neuromuscular disorders.
$(4)$ Fluoride deficiency causes fluorosis.

Which of the following is not a greenhouse gas?

Which of the following causes the depletion of the ozone layer in the stratosphere?

Which of the following is the most significant air pollutant in modern times?

Which of the following is a lung irritant?