Delhi Air Turns Very Poor As AQI Crosses 300 And BS-VI Entry Rule Begins

Representative photo: Pexels / Luke Nomad

Delhi woke up to grey skies and difficult air on Monday, 2 November 2026, as the capital's air quality slipped into the 'very poor' category. The city's overall Air Quality Index (AQI) rose to 310, up from 277 a day earlier, even as stricter pollution-control restrictions remained in force. At the same time, a new rule banning the entry of vehicles below BS-VI emission standards came into effect at Delhi's borders, with police checking vehicles at key entry points.

AQI Crosses Into Very Poor Territory

An AQI reading between 301 and 400 is classified as 'very poor', a level at which prolonged exposure can cause breathing discomfort, particularly for children, the elderly and people with respiratory conditions. Delhi's rise to 310 marks a clear deterioration from Sunday's 277, which had sat in the 'poor' category.

The picture was worse in parts of the National Capital Region. Noida's Sector 62 recorded an AQI of 362, while Greater Noida's Knowledge Park 5 stood at 331, both firmly in the 'very poor' range. Smog also blanketed parts of Mumbai, with Dadar West reporting hazy conditions as air quality deteriorated across major metros.

BS-VI Entry Rule Takes Effect

To tackle vehicular pollution, one of the capital's biggest contributors to dirty air, authorities have begun enforcing a ban on the entry of vehicles that do not meet BS-VI emission standards. On Monday, Delhi Police and Uttar Pradesh Police carried out vehicle checks at the Ghazipur border, where banners displayed the new restrictions, and issued 10 challans for violations of the rule.

BS-VI, or Bharat Stage VI, is India's strictest vehicle emission standard, roughly comparable to Euro 6 norms. Older vehicles that fall below this standard emit far higher levels of nitrogen oxides and particulate matter, the tiny particles that make smog so harmful to lungs.

Why Winter Air Gets Worse

Delhi's air typically worsens as winter approaches. Falling temperatures, calm winds and lower mixing heights trap pollutants close to the ground, while stubble burning in neighbouring states, vehicular emissions, dust from construction and Diwali-season fireworks add to the load. The Graded Response Action Plan (GRAP), a set of emergency measures triggered by worsening AQI, is already in force, but Monday's reading shows how stubborn the problem remains even with restrictions.

What Residents Can Do

Health experts advise residents to limit outdoor exertion on 'very poor' air days, keep windows closed during peak smog hours, and wear a well-fitting N95 mask when stepping out is unavoidable. People with asthma or other breathing conditions should keep inhalers handy and watch for worsening symptoms. Air purifiers can help indoors, but experts say the most effective protection is reducing exposure, especially for children and the elderly.

Conclusion

Delhi's slide into 'very poor' air, combined with the new BS-VI entry rule, shows the capital entering its most difficult air-quality season of the year. Enforcement at the borders is a step towards cutting vehicular emissions, but cleaner air will need sustained action on every source, from stubble burning to dust and construction.

Do you think the BS-VI entry rule will actually improve Delhi's air, or is much stronger action needed? Share your view in the comments.