Deccan Herald. CPCB has attributed differences between private apps and government AQI readings to measurement methods and 24-hour averages, rejecting allegations of under-reporting amid Delhi's pollution concerns. Delhi AQI data went missing during peak Diwali pollution, with 36 of 59 monitoring stations not reporting readings at 1 am. Missing Diwali pollution readings in Delhi have raised concerns over data transparency, government accountability and public trust in India's air quality monitoring.