Air Quality Analysis in Delhi (2026)
The study by EnviroCatalysts focuses on Delhi's air quality for the first half of 2026, comparing it with the same period in 2025, highlighting trends, statistics, and implications for public health.
Key Findings
- Decrease in NO₂ and Ozone Levels:
- Average nitrogen dioxide (NO₂) concentrations decreased by 9.4%, from 48 µg/m³ in 2025 to 44 µg/m³ in 2026.
- Ground-level ozone levels dropped by 20%, averaging 35 µg/m³.
- Persistently High PM2.5 Levels:
- Average PM2.5 concentrations fell slightly by 2.2%, from 90 µg/m³ in 2025 to 88 µg/m³ in 2026.
- The proportion of days exceeding the national PM2.5 standard of 60 µg/m³ decreased from 64.4% to 58.2%.
- Despite the decrease, severe pollution episodes continued during winter.
- PM10 Statistics:
- Average PM10 levels remained above 205 µg/m³, significantly exceeding the national standard of 100 µg/m³.
- Highest hourly PM10 concentration reached 989 µg/m³ on April 3, attributed to dust storms and adverse weather conditions.
- Pollution Hotspots:
- Anand Vihar, RK Puram, Ashok Vihar, and Mundka recorded high PM2.5 levels, marking them as severe 'red zones'.
- In contrast, Cantonment area, IMD Lodhi Road, and JNU recorded relatively lower pollution levels.
- WHO Guidelines:
- Delhi failed WHO's daily safety criteria on 99.5% of days for PM2.5, 99.4% for PM10, and 83.4% for NO₂.
Hourly Pollution Patterns
- Peak pollution levels were recorded between midnight and morning, peaking around 9 am due to traffic emissions.
- Air quality improved briefly in the afternoon, between 3 pm and 6 pm.
Contributing Factors and Recommendations
- Impact of Cleaner Fuels: The shift to BS-VI fuel and growing electric vehicle adoption helped reduce transport-sector emissions.
- Public Health Challenge: Delhi's air pollution is a year-round issue, requiring stricter enforcement, tighter regulation of nighttime transport, and stronger action across the airshed.
Conclusion: Despite some improvements in certain pollutants, Delhi's air quality remains a significant public health issue, necessitating comprehensive and year-round solutions.
