Which of the following does not contribute to pollution?
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Answer: C. H2
Explanation
Hydrogen gas is non-toxic and does not act as an environmental or atmospheric pollutant. When hydrogen burns or reacts naturally, its primary byproduct is harmless water vapor. Unlike carbon or sulfur compounds, molecular hydrogen poses no threat to air quality or human health. Carbon dioxide contributes significantly to global climate change by trapping infrared radiation in the atmosphere. Sulfur dioxide emissions react with atmospheric moisture to form destructive acid rain deposition. Carbon monoxide is a poisonous gas produced by incomplete combustion in industrial processes and vehicle engines.
Hydrogen fuel cells are promoted as clean energy alternatives because they release zero harmful pollutants. Environmental agencies strictly monitor industrial sulfur dioxide and carbon monoxide emissions to protect public health. Atmospheric scientists study greenhouse gases like carbon dioxide to model global temperature trends accurately. Option A is a major greenhouse gas that traps atmospheric heat and drives global climate change. Option B is a hazardous industrial pollutant that causes respiratory problems and acidic precipitation. Option D is a toxic gas emitted by combustion engines that binds to hemoglobin in human blood.
- Subject
- Agriculture
- Category
- Forestry
- Topic
- —
- Difficulty
- medium
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