Q56
Which metal pollute the air of a big city?
A.
Copper
B.
Chromium
C.
Lead
AnswerD.
Cadmium
Answer: Option C
Solution
Answer: Option C
Solution:
Major sources of lead emissions to the air today are ore and metals processing and piston-engine aircraft operating on leaded aviation gasoline. The highest air concentrations of lead are usually found near lead smelters.