Q. Which of the following are important pollutants released by the 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:
Answer: 1, 2, 3 and 4
Notes: The steel industry emits oxides of sulphur from smelting, oxides of nitrogen from combustion, carbon monoxide from incomplete combustion in blast furnaces, and carbon dioxide from extensive use of coal and energy. Therefore, all four—oxides of sulphur, oxides of nitrogen, carbon monoxide, and carbon dioxide—are key pollutants released by the steel industry in India.