Two days after the Diwali festivities, Delhi’s air quality continues to endure in the “very poor” category, exposing millions of residents to dangerous levels of pollution. According to data from the Central Pollution Control Board (CPCB), the capital’s average Air Quality Index (AQI) stood at 335 on Wednesday morning – firmly within the “very poor” range of 301 to 400. Some observing stations, such as Bawana, Wazirpur, and Jahangirpuri, even recorded readings between 390 and 423, bordering close to the “severe” mark.

The alignment of Diwali firecrackers, stubble burning in Punjab and Haryana, and stagnant meteorological conditions have captured pollutants all over the city, creating a dense smog blanket that refuses to lift. A report documented that calm winds and falling night temperatures have further slowed pollutant dispersion.

City Chokes Despite Curbs and Warnings

In spite of a full ban on firecrackers and several awareness drives, Delhi’s air quality has displayed little improvement compared to previous years. On October 22, the average AQI recorded was 345, with most of Delhi’s 38 monitoring stations reporting “very poor” readings. In many parts of the city, visibility declined below 800 metres, affecting early-morning commuters.

The Indian Meteorological Department (IMD) noticed that wind speeds of less than 4 km/h prevented the dissipation of fine particulate matter (PM2.5 and PM10), while humidity levels above 90% helped smog particles stick together, thickening the haze.

Public health experts caution that sustained exposure to AQI levels above 300 can give rise to the risk of asthma, bronchitis, and other respiratory illnesses, especially among children and the elderly. Dr. Randeep Guleria, former AIIMS director, restated that “Delhi’s pollution is now a year-round issue that worsens during winter and festival season”, highlighting the immediate and real requirement for stronger enforcement measures.

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Key Factors Behind the Post-Diwali Smog

• The large-scale bursting of firecrackers during Diwali night injected major amounts of PM2.5 and PM10, leading to a sheer overnight spike in pollution.
• Whiskers burning in neighbouring Punjab and Haryana accounted for nearly 35% of Delhi’s total PM2.5 concentration on October 21.
• Low wind velocity and temperature inversion trapped pollutants close to the ground, aggravating Delhi’s air quality further.
• An increase in vehicular emissions because of post-holiday traffic added to the pollution load, particularly in commercial areas like Connaught Place and ITO.

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Conclusion

The determined smog over the capital has prompted authorities to reintroduce Stage II of the Graded Response Action Plan (GRAP), which restricts construction, prohibits diesel generators, and urges people to work from home where possible. However, in spite of such measures, Delhi’s air quality remains stubbornly very poor – implicating the scale of the crisis and the limits of short-term interventions.

As residents continue to wear masks and rely on air purifiers indoors, experts stress that only sustained efforts – such as promoting cleaner fuels, improving public transport, and tackling crop residue burning – can deliver lasting relief. By that time, the grim haze that lingers post-Diwali will continue to serve as a reminder of the quick need for collective responsibility and stronger environmental governance in India’s capital.

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