Both CPCB and IQAir follow different methods of calculating air quality index, resulting in different numbers.

Stations at Jawaharlal Nehru Stadium, Nehru Nagar, Patparganj, and RK Puram each lost about eight hours of readings.

An analysis of CPCB and DPCC data by HT revealed that only nine stations – barely 23% of the city’s monitoring network – recorded continuous data