Final year student Srivedant Kar said only 15 out of the 50 students in his class turned up.
"Till the air quality becomes normal, I will skip classes as I have breathing issues," he said.
A student of Maitreyi College claimed no one showed up in some classes in off-campus colleges.
A professor of Rajdhani College, Rajesh Jha, said around 30 per cent of the students were absent during his lectures.
Simran Sharma of Daulat Ram College said a few classes were cancelled due to thin attendance.
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