Multiple choice

What is the average concentration of ozone in the ozone layer of the atmosphere?

  1. nearly 100%

  2. greater than 90%

  3. between 10-15%

  4. less than 10ppm
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ozone is a trace gas in the atmosphere. Even in the ozone layer, its concentration is very low, typically measured in parts per million (ppm).

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