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GATE 2018 CE (CE1) – Question 23

Air Pollution and Municipal Solid Wastes · Air pollution: pollutants, sources, impacts, control and air quality index · 1 mark · Multiple choice

A city has 20000 vehicles, each travelling 12000 km/year and emitting NOx at 2.0 g/km. Total annual NOx release is ______.

  1. 480000 kg
  2. 4800 kg
  3. 480 kg
  4. 48 kg

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Show answer and explanation

Correct answer: (A) 480000 kg

Explanation

Annual distance is $20000(12000)=240000000$ vehicle-km. Multiplying by 2 g/km and converting to kilograms gives $480000000/1000=480000$ kg (A).