Most of the atmospheric air pollutants are present in large quantity in__________________?

A. Diameter
B. Inlet gas velocity
C. Overall height
D. All A., B. & C.

A. Grinding
B. Machining
C. Cutting
D. Polishing

A. Idle running
B. Acceleration
C. Cruising
D. Deceleration

A. Incineration
B. Biological oxidation
C. Composting
D. None of these

A. Reduction in strength of leather & cloth
B. Acceleration of corrosion rates of metals
C. Increased drying & hardening time of paints
D. All A., B. and C.

A. Reduction in its dissolved oxygen content
B. Discoloration of bathroom fixtures
C. Temporary hardness
D. None of these