Delhiites on Tuesday morning woke up to extremely polluted air as the AQI was measured to be in the 'severe' category, with overall Air Quality Index at 761 as PM10 was the dominant pollutant, said the India Meteorogical Department (IMD). The visibility in the city was reduced to 192 metres at 9 a.m.

The System of Air Quality and Weather Forecasting And Research (SAFAR) also put Delhi's air quality under severe category. SAFAR said that pollutant PM10 is in severe category at 573 while PM2.5 pollutant reached 384 also in severe category.

An AQI between 0-50 is considered good, 51-100 is satisfactory, 101-200 moderate, 201-300 poor, 301-400 very poor and 401-500 is marked as severe/hazardous.