During secondary treatment of primary effluent, how does significant decrease in BOD occur?</h2></div>

Most abundant water pollutant is</h2></div>

Ozone is found in the atmosphere and helps to protect us from harmful radiation. Ozone is</h2></div>

Number of ozone depleters identified by Viena convention for Protection of Ozone Layer (1992) is</h2></div>

What is radioactive pollution? What are its effects?</h2></div>

Incomplete burning of petrol or diesel in vehicles creates .......... gas which is very poisonous. </h2>&…

If biomedical waste is not handled properly, people are likely to be affected by</h2></div>

Why is CNG (Compressed Natural Gas) preferred over petrol?