A survey on air pollution was conducted in an urban area to determine the major contaminant in air. The major contaminant estimated in all air pollution is:

A survey on air pollution was conducted in an urban area to determine

1.	A survey on air pollution was conducted in an urban area to determine the major contaminant in air. The major contaminant estimated in all air pollution is:
A.	Grit and dust
B.	Sulphur dioxide
C.	Carbon monoxide
D.	Nitrogen dioxide
Answer» C. Carbon monoxide