The central pollution control body declared public health emergency in Delhi-NCR as the Air Quality Index breached hazardous levels on Friday. The Environment Pollution (Prevention & Control) Authority has banned construction till November 5 and bursting of crackers through the winter season in the region. Delhi's air quality dropped to 'emergency' category for the first time since January. The AQI was registered at scary 491 in Anand Vihar area. Watch the full report.