What Air pollution?<br> </h2></div>

Tropospheric ozone harmful effects on humans, included:<span><br> </span></h2></div>

Which one of the following is a greenhouse gas?</h2></div>

Planting of trees on barren land is called </h2></div>

<span>The first pesticide to be used commercially was</span></h2></div>

Phosphate pollution is brought about by</h2></div>

Concentration of green house gases is increasing due to</h2></div>

Multiple Choice Questions<br> BOD is a measure of<br> </h2></div>