For a city that has long struggled with smog, that moment seemed almost miraculous. Behind the simple joy of a clear sky was a set of numbers that told a story of change: Delhi’s average Air Quality Index (AQI) for the month had dropped to 166, the lowest reading in eight years.
The AQI is a composite figure that reflects concentrations of pollutants such as particulate matter, nitrogen dioxide, and ozone. An average of 166 places Delhi in the “moderate” category, a significant step down from the 223 recorded in October 2025. The trend over the past five years shows a steady decline: 210 in 2022, 219 in 2023, 234 in 2024, 223 in 2025, and now 166 in 2026. Each of these figures represents a measurable shift in the air that millions breathe.
◆ Delhi’s average AQI dropped to 166 in October 2026, the lowest October level in eight years, compared with 223 in October 2025. ◆ The city recorded 220 days with AQI below 200 from January to October. PM2.5 levels declined, while PM10 rose slightly. @CPCB_OFFICIAL @CAQM_Official #DelhiAQI #DelhiAirPollution #AirQuality #DelhiNCR #Pollution
While the headline figure grabs attention, the underlying pattern is equally compelling. The number of days in October with poor air quality—those days when the AQI exceeded 300—has also fallen. Though the exact count isn’t specified, the reduction signals that the city is experiencing fewer severe pollution episodes.
Though the exact count isn’t specified, the reduction signals that the city is experiencing fewer severe pollution episodes.
Central to this progress is the Air Quality Management Committee (CAQM), the body tasked with monitoring and improving Delhi’s air quality. By tightening regulations and encouraging compliance, CAQM has helped bring the city’s air quality down to its lowest level in eight years.
Delhi has two very different things making headlines this weekend! 🌧️ The capital records its cleanest October air in over a decade, while Ramlila Maidan prepares for a major INDIA bloc rally tomorrow. AQI at 60, political temperatures set to rise! 😄 Nature has cleared the air. Politics will take it from here! #Delhi #RamlilaMaidan #AQI
The drop from 210 in October 2022 to 166 in October 2026 may seem modest at first glance, but it represents a meaningful shift in the daily experience of Delhi’s residents. Over eight years, the average AQI has moved from a figure that often triggered health advisories to one that allows more outdoor activity without the same level of concern.
While October 2026’s average AQI of 166 marks a historic low, the journey is far from over. The CAQM remains vigilant, continuing to monitor pollutant levels and enforce regulations. As Delhi moves forward, the city’s experience offers a hopeful blueprint for other megacities grappling with air quality challenges.
Any reasons why mountain peaks are becoming visible from Haridwar, northern parts of Bihar & Bengal ? Delhi is also experiencing fresh air & low aqi this time ! What went right this time? https://t.co/5XA7JvJQrB