Delhi-NCR air quality plummeted into the very poor category as the regional air quality index crossed 300 ahead of Diwali, prompting authorities to enforce emergency restrictions under Stage II of the Graded Response Action Plan to curb dust and vehicle emissions.
Toxic air pollution in New Delhi surged on Nov 4 to more than 30 times the World Health Organization’s recommended daily limit, according to data from air monitors cited by The Straits Times. The sharp deterioration arrived just days after authorities implemented emergency measures to combat smog in a metropolis home to more than 30 million people.
Emergency Restrictions Take Effect Across Delhi-NCR
The Commission for Air Quality Management (CAQM) activated Stage II of the Graded Response Action Plan after unfavorable meteorological conditions trapped pollutants. Officials noted that the index readings entered the very poor category, with the Central Pollution Control Board (CPCB) registering an air quality index of 349 near Akshardham Temple and 335 around India Gate and Janpath, as reported by News24Online. In parts of the city monitored by IQAir, concentrations of fine particulate matter crossed 461 micrograms per cubic metre. By Wednesday morning, the air quality index in Delhi reached 377, with the metric factoring in eight primary pollutants—among them PM2.5, which consists of microscopic particles roughly 30 times thinner than a human hair capable of reaching deep into the respiratory system.
#WATCH | Delhi: The Air Quality Index (AQI) in the area around India Gate and Janpath is at 335, categorised as 'Very Poor', as per the CPCB (Central Pollution Control Board). (Visuals shot at 06:39 am) pic.twitter.com/IKyYMg0TBk
Under the winter pollution control plan, authorities restricted diesel generator use outside of emergency services and halted dust-generating demolition and construction activities, though essential government and infrastructure projects received conditional exemptions. To discourage private vehicle use, parking charges at authorized lots were doubled through February 28, 2027. The Delhi Metro introduced 20 additional weekday train trips, and officials staggered government office hours to alleviate traffic congestion, the, BBC reported.
Stricter Vehicle Norms and Fuel Controls at Pumps
During the opening rollout of the winter campaign, enforcement teams inspected roughly 15,000 vehicles, turned back 1,539 commercial vehicles at border checkpoints, and issued challans to 566 motorists for lacking valid pollution certificates.
Weather Patterns and Crop Stubble Burning Drive Delhi Pollution
The annual winter crisis follows an unusually clean October that recorded the lowest average air quality index for the month in eight years. However, falling temperatures, low wind speeds, and returning northwesterly winds carried smoke from crop stubble burning in the neighboring states of Punjab and Haryana directly toward the capital, compounding local vehicular and industrial exhaust. As the weather settled, northwesterly winds returned, carrying smoke from burning fields towards the capital.
According to India’s Environment Ministry, vehicles account for 23 percent of Delhi’s winter pollution, biomass and stubble burning contribute 20 percent, and industry—including coal-fired power plants—accounts for 9 percent. The single largest share, at 27 percent, stems from secondary particles formed when gases from vehicles, industry, power plants, and biomass react in the atmosphere.
#WATCH | Delhi: The Air Quality Index (AQI) in the area around Akshardham Temple is 349, categorised as 'Very Poor', as per the CPCB (Central Pollution Control Board). (Visuals shot at 6:55 am) pic.twitter.com/8CfomuX3d4
Scientists point out that agricultural fertilizers heavily applied across northern fields accelerate this secondary particulate formation. Ammonia released from these compounds creates a reactive chemical base layer in the atmosphere.
The sheer quantity of ammonia that is going into the atmosphere creates a base layer for other pollutants to react with.
With Diwali approaching on November 8, public health officials warn that fireworks displays will add further particulate pollution to an already strained atmosphere. While the Supreme Court permitted the limited use of reduced-emission green crackers, authorities remain on high alert as monitoring stations forecast that air quality will stay in the very poor range. AQI scores between 301 and 400 are categorized as very poor by the nation’s pollution regulator, whereas levels exceeding 400 are deemed severe.