List of top Air and Noise Pollution Questions on Pollution

A gravity settling chamber of height ‘H' and length ‘L' is designed to control particulate air pollution. In the chamber, the horizontal velocity of air flow is $'V_h'$ and terminal settling velocity of the target particle is $'V_ť$. Which one of the following expressions is the correct concept used to calculate the minimum size of the target particle that will be removed with 100% efficiency?

The equipment that can be used to control particulate air pollution in an industrial unit is/are

Which is/are the secondary air pollutant(s)?