Atmospheric SO2 concentrations hover around:
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Answer: A. 0.01 ppm
Explanation
Atmospheric sulfur dioxide concentrations naturally hover around 0.01 ppm under baseline conditions. Volcanic activity and biological processes maintain this low background level in clean air. Higher concentrations typically indicate industrial pollution or localized volcanic emissions. Sulfur dioxide is a trace gas found in the Earth's lower atmosphere. Natural geochemical cycles release small amounts of sulfur gases into the troposphere. Environmental agencies enforce air quality standards to keep ambient sulfur dioxide extremely low.
Atmospheric scientists measure baseline sulfur dioxide to assess the impact of industrial pollution. Excessive sulfur dioxide concentrations contribute to respiratory illnesses and environmental acidification. Global air monitoring networks track trace gas levels to evaluate atmospheric health trends. Option B is incorrect because 0.001 ppm underestimates normal tropospheric background levels. Option C is wrong because 0.5 ppm represents heavily polluted industrial air, not baseline air. Option D is inaccurate because 0.75 ppm is dangerously high and toxic for ambient air.
- Subject
- Agriculture
- Category
- Forestry
- Topic
- —
- Difficulty
- medium
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