State any two harmful effects each of:
$(a)$ Air pollution,and
$(b)$ Water pollution.

(N/A) Two harmful effects of air pollution:
$(i)$ Respiratory problems like asthma and bronchitis.
$(ii)$ Acid rain,which damages buildings and aquatic life.
$(b)$ Two harmful effects of water pollution:
$(i)$ Spread of water-borne diseases such as typhoid,cholera,and jaundice.
$(ii)$ Eutrophication,which leads to oxygen depletion and death of aquatic organisms.