Delhi air became toxic on Wednesday, deteriorating further as construction and demolition activities resumed in the national capital alongside the entry of trucks into the state and the resumption of physical classes.
The Air Quality Index (AQI) in the national capital was at 385 --'very poor'-- at 8 am, according to the Ministry of Earth Sciences' air quality forecast agency SAFAR. Readings below 50 are considered safe, while anything above 300 is considered hazardous or 'severe'.
Preliminary data from a month-long experiment has shown that indoor air pollution levels were nearly half of the outdoor levels in Delhi-NCR during November-December