According to Central Pollution Control Board (CPCB), particulate size _______ micrometers or less in diameter are responsible for causing the greatestÂ harm to human health.

According to Central Pollution Control Board (CPCB), particulate size

1.	According to Central Pollution Control Board (CPCB), particulate size _______ micrometers or less in diameter are responsible for causing the greatestÂ harm to human health.
A.	0.5
B.	2.5
C.	5
D.	10
Answer» C. 5