Fluoride pollution primarily affects the ...... .

According to the $CPCB$,what is the significance of particulate matter with a diameter of $2.5 \ \mu m$ or less?

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

Catalytic converters,which have expensive metals as catalysts,are fitted into automobiles for reducing emission of poisonous gases. Which of the following is $NOT$ used in them?

The secondary pollutant that inhibits the Hill reaction is:

Pick out the correct statement.