Delhi Air Monitors Fail on Diwali as Pollution Soars Past 3,000
Delhi witnessed an alarming pollution spike following Diwali celebrations, with newly released government data revealing that PM2.5 concentrations crossed 3,700 micrograms per cubic metre at some monitoring locations. The figures exposed the severity of the capital’s air pollution crisis, raising fresh concerns about public health and the reliability of official air-quality monitoring.
According to data released by the Delhi Pollution Control Committee (DPCC) on November 9, 2026, Mundka recorded the highest PM2.5 concentration at 3,744 µg/m³ around 2 am. Jawaharlal Nehru University (JNU) registered 3,023 µg/m³ at 4 am, while NSUT West Campus recorded 3,008 µg/m³ at 5 am.
The alarming figures emerged after several air-quality monitoring stations stopped reporting PM2.5 readings during the most polluted hours of Diwali night. Monitoring records showed that pollution measurements were missing from multiple locations precisely when concentrations were approaching the instruments’ upper measurement limits.
The problem raised serious questions about whether Delhi’s official Air Quality Index (AQI) adequately represented the actual pollution exposure experienced by residents. While the highest PM2.5 reading available in the Central Pollution Control Board’s records was 1,000 µg/m³, subsequently released DPCC data revealed concentrations several times higher.
An analysis by the Centre for Research on Energy and Clean Air (CREA) also identified significant gaps in monitoring data. Of Delhi’s 59 monitoring stations, 45 recorded missing hourly readings for at least one pollutant during Diwali day. Experts warned that excluding these extreme measurements could result in an underestimate of actual pollution levels.
The situation was further complicated by unfavourable weather conditions. Calm winds, high humidity and a shallow atmospheric mixing layer prevented pollutants from dispersing effectively, allowing smoke from firecrackers and other emission sources to accumulate close to the ground.
According to pollution experts, the concentration of PM2.5 during the episode reached exceptionally dangerous levels. These microscopic particles can penetrate deep into the lungs and enter the bloodstream, increasing the risk of respiratory complications, cardiovascular problems and other serious health conditions.
The pollution controversy also triggered a political confrontation in Delhi. Aam Aadmi Party leaders accused the BJP-led government of manipulating pollution figures and questioned the functioning of monitoring stations. The BJP rejected the allegations and pointed towards stubble burning in Punjab, alongside the long-standing contribution of other pollution sources.
Environmental experts, however, stressed that Delhi’s air pollution cannot be attributed to a single factor. Vehicle emissions, industrial activity, construction dust, waste burning, agricultural residue burning and firecracker smoke collectively contribute to the capital’s deteriorating air quality.
The latest revelations have intensified demands for greater transparency in pollution monitoring, improved equipment and stricter enforcement of environmental regulations. Experts have also called for monitoring systems capable of accurately recording extremely high pollution concentrations rather than allowing critical readings to disappear during peak pollution episodes.
For millions of Delhi residents, the Diwali pollution episode has once again highlighted the growing public-health challenge of breathing clean air in India’s national capital. The central question now is whether authorities can ensure reliable pollution measurements and implement effective measures before the winter smog crisis becomes even more severe.
