Sound becomes a hazardous noise pollution if its level exceeds (in $, dB$)

According to the Central Pollution Control Board $(CPCB)$,which size of particulate matter (diameter) is responsible for causing the greatest harm to human health?

Particulate matter with a diameter of $2.5$ micrometres or less and a sound level of $150$ $dB$ or more causes the greatest harm to human health.

Which of the following is associated with biomagnification?

The first commercial pesticide was:

What is the gradual increase in the concentration of toxicants at successive trophic levels called?