I would expect smog to block or reflect incoming sunlight, lowering local temperatures

I’m sure you’re not implying that it’s their own fault, but just for others that might read your comment…

Smog in South East Asia is a complex problem. It’s not as simple as Delhi people doing things to make it smoggy. For example, in a lot of places the smog is from burning the stubble left over from crops. It does drift across international borders, so the people living with it often are not culpable in any way.

Additionally, it tends to be seasonal, sort of November to February.

Suffice to say the current temperature spikes are unlikely to be caused by smog and even if they were it’s not necessarily the fault of the good people of Delhi.