Which of the following pollutant gases is not produced both naturally and as a result of industrial activity?
Chlorofluoro carbons
To identify which of the given pollutant gases is not produced both naturally and as a result of industrial activity, let's consider each option:
- Chlorofluoro carbons (CFCs): These are man-made compounds that contain chlorine, fluorine, and carbon. They do not occur naturally and are primarily produced for use in refrigeration, air conditioning, packaging, and insulation. Therefore, CFCs are only industrially produced.
- Nitrous oxide (N2O): This gas is emitted from natural sources such as soil under natural vegetation and the ocean, as well as human activities like agriculture and industrial processes.
- Methane (CH4): Methane is produced naturally by anaerobic decomposition in wetlands and ruminant digestion. It is also emitted during the production and transport of coal, oil, and natural gas.
- Carbon dioxide (CO2): Carbon dioxide is produced naturally from respiration, volcanoes, and forest fires, and from burning fossil fuels and cement production in industrial processes.
The pollutant gas that is not produced naturally, but only as a result of industrial activity, is Chlorofluoro carbons (CFCs).
Conclusion: The correct answer is Chlorofluoro carbons, which aligns with the given information.
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