Overview
- Envirocatalysts released a public dashboard built on daily CPCB records since 2015 to track pollutant-wise trends across Delhi and the NCR.
- The tool shows Delhi’s annual average ozone rose from 52 µg/m³ in 2021 to 66 µg/m³ in 2025, with ozone-dominant days jumping from 33 to 76 in 2025.
- Long-term data indicate NO2 and CO have declined since 2015, while PM2.5 and PM10 have fallen from 2015 levels yet still exceed Indian and WHO limits.
- April data show PM10 was the dominant pollutant on 52% of monitored days across the NCR, and Delhi’s PM2.5 average fell to 68 µg/m³ even as cities such as Ghaziabad and Gurgaon worsened.
- Seasonal patterns differ by pollutant, with particulates spiking in winter and ozone forming in summer sunlight, which points regulators to target sources rather than rely on aggregate AQI.