1.

If natural materials are pollutants, why do we not perceive their adverse effects during their use? When such materials are referred as pollutants?

Answer»

We don't PERCEIVE their ADVERSE EFFECTS because we have a good immunity and also a good measure are taken before using such materials for EG using mask
such MATTER are referred to as pollutants when they contaminate anything and we cannot take any safety measures and now we become sick



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