UPSC Prelims 2019 Question:

Consider the following

1. Carbon monoxide 
2. Methane 
3. Ozone 
4. Sulphur dioxide
   
   

Which of the above are released into the atmosphere due to the burning of crop/biomass residue?

Explanation: 

• Crop residue burning is a potential source of GreenHouse Gases (GHGs) and other chemically and radiative gasses and aerosols.
  
  
• Burning of these residues emit gasses like sulphur dioxide (SO2), oxides of nitrogen (NOx), carbon dioxide (CO2), carbon monoxide (CO), black carbon (BC), methane (CH4), volatile organic compounds (VOC), ozone (O3) etc. So, points 1, 2, 3 and 4 are correct.
  
  

Therefore, option (4) is the correct answer.

Subject: Environment | Pollution