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.

In sea traffic, why is noise pollution confined to the harbour?

Due to loading and unloading activities being carried out there.

In sea traffic, noise pollution is confined to the harbour due to loading and unloading activities being carried out.