Fluoride pollution primarily affects the ...... .

Which chemical compound caused the death of thousands of people in the Bhopal gas tragedy?

$dB$ is a standard abbreviation used for the quantitative expression of

Which of the following gases is most harmful to plants?

Exposure to a noise level of $............$ or more for a short period can damage the eardrums,leading to permanent hearing impairment. (in $,dB$)

$A$ range of loudness of sound of $70-90$ decibels is rated as: