The crop waste and dry leaves burning has begun.
I go for an evening walk at an empty under construction flyover(for silence) near the yamuna floodplains in the evenings. There's a whole lot of illegal farms and this is just one of them burning. Come sunset the visibility drops to near zero because of all the other farms burning their crap.
Not discrediting the industrial and vehicular pollution at all, but this just goes to show how much it happens.
During peak winters, I've seen this endless smog even after heading 150km north of Delhi.