The concentration of SO2 in the atmosphere is around:
Correct answer: A. 0.01 ppm
- A. 0.01 ppm
- B. 0.001 ppm
- C. 0.5 ppm
- D. 0.75 ppm
Explanation
The approximate background concentration of sulphur dioxide in clean atmospheric air is commonly given as about 0.01 ppm in environmental science texts. Higher values such as 0.5 or 0.75 ppm indicate polluted conditions rather than normal atmospheric concentration.
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