Which of the following are some important pollutants released by steel

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Which of the following are some important pollutants released by steel industry in India?

  • 1. Oxides of sulphur
  • 2. Oxides of nitrogen
  • 3. Carbon monoxide
  • 4. Carbon dioxide

Select the correct answer using the code given below.

1, 3 and 4 only
2 and 3 only
1 and 4 only
1, 2, 3 and 4
This question was previously asked in
UPSC IAS – 2014
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Steel industry processes are significant sources of various air pollutants, including oxides of sulphur, oxides of nitrogen, carbon monoxide, and carbon dioxide.
Oxides of sulphur (SOx) and nitrogen (NOx) are produced during the combustion of fuels and from raw materials containing sulphur and nitrogen. Carbon monoxide (CO) is a product of incomplete combustion. Carbon dioxide (CO2) is produced from the combustion of carbon-based fuels (like coal or coke) and also from chemical reactions involved in steel production (e.g., reduction of iron oxides). All four listed pollutants are associated with steel manufacturing.
Steel plants also release particulate matter, volatile organic compounds (VOCs), and heavy metals. Controlling these emissions is a major environmental challenge for the industry.

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