The threshold limit value (TLV) for carbon monoxide in air is set below 50 ppm, with the primary source of this pollutant being____________________?
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Answer: B. Automobiles exhaust
Explanation
Automobile exhaust emissions are the primary anthropogenic source of carbon monoxide in urban air environments. Incomplete combustion inside millions of vehicle engines pumps massive amounts of carbon monoxide into city streets. Urban air quality data confirms that vehicular traffic is the dominant contributor to atmospheric carbon monoxide levels. Threshold limit values for carbon monoxide are established below fifty parts per million to prevent chronic poisoning. Internal combustion engines produce carbon monoxide when burning gasoline with insufficient oxygen inside cylinders. Catalytic converters reduce tailpipe carbon monoxide emissions, but urban traffic volume still drives overall pollution.
Metropolitan air pollution management programs focus heavily on automobile emission inspections and traffic controls. Pedestrians and traffic police face elevated carbon monoxide exposure risks along congested urban roadways. Adopting electric vehicles and hybrid technologies significantly reduces urban atmospheric carbon monoxide concentrations. Option industrial chimney exhaust emits large amounts of sulfur dioxide but contributes less carbon monoxide than traffic. Option photochemical reactions in polluted atmospheres create secondary smog pollutants rather than primary carbon monoxide. Option burning of domestic fuel contributes minor carbon monoxide emissions compared to heavy urban automotive traffic.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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