What is the source of grey-air smog? 

A)  carbonic acid particles suspended in the air 
B)  carbon dioxide particles suspended in the air 
C)  soot particles suspended in the air 
D)  ammonium salts particles suspended in the air

Grey-Air Smog

A type of air pollution characterized by a mixture of pollutants, including particulate matter and chemicals, that gives the air a dirty, grey appearance.

Carbonic Acid

A weak acid formed when carbon dioxide is dissolved in water, it plays a crucial role in the carbon cycle and ocean acidification.

Soot Particles

Tiny, black carbon particles produced by the incomplete combustion of fossil fuels, wood, and other materials.