Q: 95 (IAS/2019)

Consider the following:
1. Carbon monoxide
2. Methane
3. Ozone
4. Sulphur dioxide
Which of the above are released into atmosphere due to the burning of crop/biomass residue?
question_year: 
2019
question_exam: 
IAS
stats: 
0,248,152,40,32,80,248