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Delhi's Air Quality: Ozone Surges as Other Pollutants Drop
6 May
Summary
- Ozone levels are a growing concern in Delhi, increasing significantly.
- Nitrogen dioxide and carbon monoxide emissions have seen a decline.
- Particulate matter remains above safe limits despite some reductions.
A newly launched public air quality dashboard, utilizing Central Pollution Control Board data since 2015, indicates a significant shift in Delhi's pollution patterns. While emissions of nitrogen dioxide and carbon monoxide have decreased, ozone pollution presents a growing challenge. Fine particulate matter (PM2.5) and coarse particles (PM10) typically peak in winter, influenced by stagnant atmospheric conditions.
However, ozone levels surge during summer months, particularly in May, driven by photochemical reactions. Delhi's annual average ozone concentration rose from 52 µg/m³ in 2021 to 66 µg/m³ in 2025. This trend is also observed in neighboring cities like Meerut and Noida, suggesting a wider regional issue.
Despite a long-term decline in PM2.5 and PM10 levels since 2015, both remain substantially above national and global safety standards. Coarse particulate matter, like PM10, continues to be a significant concern, often dominating pollution levels due to dust from construction and road surfaces.
Air quality in Delhi is closely linked to the wider National Capital Region (NCR). While Delhi showed year-on-year improvement in PM2.5 levels in April, surrounding cities like Ghaziabad and Gurgaon recorded worsening trends, indicating a complex and evolving air quality scenario.
