Everyday Science
NULL
Medium
Question
Which metal has long been a major air pollutant in big cities?
A
Copper
B
Chromium
C
Lead
✓ Official correct answer
D
Cadmium
Community credibility
Registered members can vote for the answer they believe is correct today and explain why. If the facts change after an election or news event, suggest a new option so others can vote it up.
A
Copper
No member explanations yet for this option.
B
Chromium
No member explanations yet for this option.
C
Lead
No member explanations yet for this option.
D
Cadmium
No member explanations yet for this option.
Explanation
Lead from fuel and industry historically polluted urban air.
So the correct answer is Lead.
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