First slide

Air Pollution and its Control

Question

In the context of environmental pollution, PM 2.5 refers to

Moderate

A

Particulate matter of diameter 2.5 micrometres or more
B

Particulate matter of diameter 2.5 micrometres or less
C

Pesticide molecules whose concentration is more than 2.5 ppm
D

Plastic material of molecular weight 2.5 Daltons or more

Solution

PM 2.5 refers to particulate matter of diameter 2.5 micrometres or less. They cause harm to human health. These fine particulates can be inhaled deep into the lungs and can cause breathing and respiratory symptoms, irritation, inflammations and damage to the lungs and premature deaths.

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