CAQM imposes GRAP-III in Delhi-NCR ahead of Diwali as AQI soars to 382: Here’s what’s allowed and restricted

GRAP Stage III is the third level of Delhi-NCR's emergency air-pollution response plan. It normally applies when the AQI reaches 401–450, classified as severe. The measures become stricter as air quality deteriorates. They target construction, vehicles, industries and other pollution sources.

Delhi's average AQI was 382 on Friday, which falls in the very poor range of 301–400. CAQM still acted because forecasts indicated that pollution could enter the severe category from Saturday. Diwali celebrations, vehicle emissions and peak stubble burning were expected to increase the pollution burden.

Stage III restrictions were added to controls already operating under Stages I and II. They included a ban on non-essential construction, restrictions on BS-III petrol and BS-IV diesel vehicles, hybrid classes up to Class 5, and closures affecting polluting industries, stone crushers and mining. The decision was therefore preventive, not a response only to the current average.

An AQI of 382 is classified as very poor under the Central Pollution Control Board's six-level system. Very poor covers readings from 301 to 400. The next category, severe, begins at 401. That means Delhi's average was just 19 points below the severe threshold, showing that the city was close to a more dangerous pollution level.

The average also did not describe every neighbourhood equally. Of 58 monitoring stations reporting data, 26 recorded severe air quality and 31 recorded very poor air quality. Punjabi Bagh recorded the highest AQI at 453. Jahangirpuri reached 447, while Rohini recorded 444. Only Lodhi Road reported poor air quality.

Delhi's average rose from 369 the previous day to 382. The Air Quality Early Warning System predicted severe conditions between 7 and 9 November. Its following six-day outlook suggested that pollution would fluctuate between very poor and severe.

GRAP Stage III restricts activities that can add substantial pollution during a worsening episode. Non-essential construction and demolition are banned. Polluting industries using non-approved fuels must close. Stone crushers and mining-related activities are suspended across Delhi-NCR. BS-III petrol and BS-IV diesel vehicles also face restrictions.

Construction tied to essential infrastructure may continue if it follows dust-control rules. Other lower-dust activities may also proceed when they meet dust-mitigation and construction-waste requirements. The rules therefore distinguish between essential work and activities that can be paused without affecting critical infrastructure.

Metro and public bus services can operate as usual, and authorities may increase their frequency or add buses. Eligible BS-VI vehicles, CNG vehicles and electric vehicles can continue to ply under existing regulations. Offices may also adopt hybrid or work-from-home arrangements, while schools up to Class 5 move to hybrid classes wherever feasible.

Delhi's average AQI was already 382, close to the severe threshold of 401, before Diwali. If fireworks, vehicle emissions and stubble burning add more pollutants, the city could cross that threshold. The result could be a wider spread of severe readings and more intense smog across Delhi-NCR.

The monitoring data shows how quickly conditions can become serious. Twenty-six of 58 stations reported severe air quality on Friday. Punjabi Bagh recorded an AQI of 453, while Jahangirpuri and Rohini recorded 447 and 444. These readings were already above the city's severe threshold, even though the overall average remained very poor.

The Air Quality Early Warning System forecast severe AQI between 7 and 9 November. It also predicted that pollution would fluctuate between very poor and severe during the following six days. That outlook explains why CAQM imposed Stage III early and why additional restrictions could remain necessary after Diwali.

Pollution becomes especially severe around Diwali because several sources are expected to increase at the same time. The article identifies Diwali celebrations, vehicular emissions and the peak stubble-burning season as factors that could add to Delhi-NCR's pollution burden. These sources arrive when air quality is already very poor.

By Friday, Delhi's average AQI had reached 382, up from 369 a day earlier. A layer of smog covered the city and reduced visibility. Several stations had already crossed AQI 400, including Punjabi Bagh at 453, Jahangirpuri at 447 and Rohini at 444. This shows that severe pollution was already present in some areas.

Forecasts indicated that pollution could turn severe from Saturday, around the Diwali period. The Air Quality Early Warning System expected severe conditions from 7 to 9 November, followed by fluctuations between very poor and severe. CAQM therefore used Stage III as a precaution before the average crossed 401.

Air-quality monitoring stations measure pollutants in the air and convert their concentrations into an AQI reading. The AQI combines pollution information into a scale that describes conditions from good to severe. The article does not detail the instruments or calculation method, but it shows that Delhi uses many stations to track local conditions and calculate an average.

On Friday, 58 stations reported data. Twenty-six recorded severe readings, 31 recorded very poor readings and only Lodhi Road recorded poor air quality. Punjabi Bagh reported 453, Jahangirpuri 447 and Rohini 444. These station readings capture conditions at particular locations, where pollution can be higher than elsewhere.

Delhi's average was 382 because it combines readings across the city rather than taking the worst station as the citywide result. The contrast matters for policy and residents. Even before the average reached 401, several neighbourhoods were already in the severe category, supporting CAQM's precautionary Stage III decision.

Particulate matter, often called PM, is a mixture of tiny solid particles and liquid droplets suspended in air. It can come from combustion, dust and other sources. The article discusses AQI, smog and pollution sources but does not define particulate matter or explain its health effects. These details come from established health science.

The smallest particles can travel deep into the lungs. Some can pass from the lungs into the bloodstream. Exposure can irritate airways, worsen breathing problems and increase strain on the heart and blood vessels. Health risks depend on particle size, concentration, exposure time and a person's vulnerability.

Delhi's conditions make the issue important. The average AQI reached 382, visibility fell under a layer of smog, and 26 stations recorded severe air quality. With Diwali, traffic and stubble burning expected to add pollution, exposure could rise further. The forecast of severe conditions from 7 to 9 November underlines the need for continued controls.