Delhi: GRAP-3 curbs imposed as 26 monitoring stations record ‘severe’ air quality

GRAP-3 is Stage 3 of the Graded Response Action Plan, a series of escalating measures used in Delhi-NCR. Its purpose is to prevent air quality from worsening once pollution reaches a specified level. The Commission for Air Quality Management imposed it as a precaution after conditions deteriorated toward the severe category.

At 5.05 pm, Delhi’s average AQI was 380. Twenty-five of 58 active monitoring stations recorded severe air quality, while one recorded severe-plus levels. Punjabi Bagh had the highest reading, at 453. These figures showed that pollution was not limited to one isolated location.

GRAP-3 adds restrictions to measures already introduced under Stages 1 and 2. It bans non-essential construction, closes stone crushers and mining activities, and shifts primary classes through Class 5 to hybrid learning. The goal is to reduce emissions quickly while pollution remains dangerously high.

The pollution was extremely high across Delhi. At 5.05 pm, the city’s average AQI was 380, placing it in the “very poor” range and close to the severe threshold. The readings prompted authorities to impose GRAP-3 restrictions as a precaution.

Pollution was widespread among the monitoring locations. Of 58 active stations, 25 recorded severe air quality and one recorded severe-plus levels. Together, that means 26 stations reported readings at or above the severe category. Punjabi Bagh recorded Delhi’s highest AQI, at 453, followed by Jahangirpuri at 447 and Rohini at 444.

The wider region also faced serious pollution. Noida recorded 300, Greater Noida 314, Ghaziabad 259, and Gurugram 365. These readings ranged from poor to very poor, showing that dangerous air extended beyond Delhi’s boundaries and affected much of the National Capital Region.

GRAP-3 adds stronger controls to the restrictions already operating under Stages 1 and 2. It is designed to reduce activities that generate dust and emissions when Delhi-NCR’s air approaches the severe category. The measures affect construction, mining, stone crushing, and primary education.

Non-essential construction work is banned, while stone crushers and mining activities must close. Primary schools up to Class 5 shift to hybrid mode. Parents and students can choose between offline and online classes wherever that option is available. These rules directly change work sites and school attendance.

Daily life may become less predictable for construction workers, businesses, families, and younger students. Construction projects can pause, mining-related operations can stop, and parents may need to arrange online learning. The restrictions remain part of a wider effort to prevent pollution from worsening, alongside earlier Stage 1 and Stage 2 measures.

The Air Quality Index, or AQI, expresses air pollution through a numerical scale. Lower values indicate cleaner air, while higher values show worsening conditions. The index helps authorities and the public understand pollution levels and decide when stronger controls are needed.

The article places 380 in the “very poor” band, which runs from 301 to 400. A value of 401 begins the “severe” category, which continues through 450. Anything above 450 is called “severe plus.” For comparison, 0 to 50 is good, 51 to 100 satisfactory, 101 to 200 moderate, and 201 to 300 poor.

Delhi’s average AQI of 380 therefore indicated very poor air that was close to severe. Punjabi Bagh reached 453, making it severe-plus. These readings explain why GRAP-3 was imposed and why authorities treated the situation as requiring immediate preventive action.

Delhi-NCR’s winter pollution has no single source in the article. It identifies vehicular pollution, stubble burning in Punjab and Haryana, firecrackers during Diwali, industrial emissions, and emissions from coal-fired plants. Falling temperatures and weaker winds also contribute by worsening the conditions in which pollution accumulates.

The Supreme Court specifically described vehicular emissions as a “major” contributor to air pollution in the national capital region. The article also links Diwali firecrackers and agricultural stubble burning to the seasonal problem. These sources release pollution into air that is already vulnerable to buildup.

The combined effect makes winter especially difficult for Delhi. The article notes that Diwali will be celebrated on November 8, while certified green firecrackers were allowed in Delhi-NCR for two festival days. It also says authorities need immediate, medium-term, and long-term measures, not restrictions alone.

Delhi’s winter air worsens when falling temperatures and decreased wind speeds make pollution harder to disperse. The article identifies both conditions as contributors to the seasonal problem. Pollution from vehicles, fires, industries, power plants, and other sources can then remain concentrated over the region.

The key mechanism is reduced movement of polluted air. When winds are weak, emissions do not spread away as quickly. Cooler winter conditions can also support a more stable layer of air near the ground, limiting vertical mixing. This explanation uses established atmospheric science; the article itself lists falling temperatures and decreased wind speeds as contributors.

As pollution accumulates, monitoring stations record higher AQI values. Delhi reached an average of 380, while 25 stations recorded severe readings and one recorded severe-plus air. That seasonal pattern is why authorities use GRAP stages and why the Supreme Court called for immediate, medium-term, and long-term action.

Monitoring stations measure pollutants in the air and convert their readings into an Air Quality Index value. The article says the Sameer application provides hourly updates published by the Central Pollution Control Board. It also reports results from 58 active monitoring stations across Delhi, allowing officials to track pollution citywide.

The article does not specify the measurement instruments or name the pollutants included in its AQI calculation. Under India’s standard National Air Quality Index, the pollutants commonly assessed are particulate matter PM10 and PM2.5, nitrogen dioxide, sulphur dioxide, carbon monoxide, ozone, ammonia, and lead. This pollutant list comes from established national practice, not from the article.

The station readings are then grouped into categories such as very poor, severe, and severe-plus. Delhi’s average was 380, while Punjabi Bagh reached 453. Those results supported the decision to impose GRAP-3 across Delhi-NCR.