Various types of chemicals used in modern agriculture such as inorganic fertilisers, pesticides and herbicides are also pollution-generating components. These chemicals are washed down to rivers, lakes and tanks. These chemicals also infiltrate the soil to reach the groundwater. Fertiliser induces an increase in the nitrate content of surface waters. Cultural activities such as pilgrimage, religious fairs, tourism, etc. also cause water pollution.

Which of the following statements is correct?

a- Air pollution can also cause acid rain.
b- Rainwater analysis of the urban environment has indicated that the pH value of the first rain after summer is always greater than the subsequent rains.

Only statement a is correct.

Air pollution can also cause acid rains. Rainwater analysis of urban environment has indicated that pH value of the first rain after summer is always lower than the subsequent rains.