Multiple choice general knowledge science & technology

Which metal pollute the air of a big city?

  1. Copper

  2. Chromium

  3. Lead

  4. Cadmium
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lead is a notorious air pollutant in big cities, primarily from vehicle exhaust and industrial emissions. Other metals like copper, chromium, and cadmium can be toxic but are not typically associated with urban air pollution.

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