People in Delhi find it difficult to breathe as air turns toxic

In many areas of Delhi-NCR the Air Quality Index has crossed 500. Keeping in mind the deteriorating situation in these areas it has been decided by the government for close all the schools for two days. Because of pollution schools in Delhi-NCR will remain close today and tomorrow. 
The use of stone crusher and hot mix plant has also been banned in Delhi for two days mainly because of pollution.