Question

why are pesticides considered as pollutants despite being useful to the farmers

Answer 1

because when they penetrate into soil with water, the chemical present in pesticides cause pollution and the soil may turn infertile.

Answer 2

In agriculture, pesticides are used to control or kill plant pests. Although they are beneficial to farmers, pesticides can cause air, water, soil pollutions and affect plant and animal life.

Chemical compounds in pesticides are responsible for their action. These compounds seep into the soil, are taken down as runoff into larger water bodies, and they are not degraded. This pollutes the soil and water.

Volatile pesticides evaporate into the air and can be drifted by wind by a process called pesticide drift. Pesticides in soil interrupt with nitrogen fixation in plants, can kill pollinators like bees, birds and also aquatic life.