According to Central Pollution Control Board (CPCB), which particulate size in diameter (in micrometers) of
the air pollutants is responsible for greatest harm to human health?
(1) 5.2 - 2.5
(2) 2.5 or less
(3) 1.5 or less
(4) 1.0 or less
Sol. Answer (2)
This is the report of Central Pollution Control Board.