Grap 3 curbs implemented in Delhi-NCR as air quality remains in ‘very poor’ category

GRAP Stage 3 is a set of emergency measures under the Graded Response Action Plan. It is designed to reduce pollution when Delhi-NCR's air quality becomes dangerously poor. The restrictions target dust from construction and emissions from vehicles, while also changing schooling and possible office arrangements.

Authorities introduced Stage 3 as Delhi's AQI stood at 382, classified as very poor, and moved closer to 400, the severe category. Construction activities such as excavation, demolition, brickwork, road building and tile cutting were prohibited. Older vehicles also faced movement restrictions in Delhi and several NCR districts.

The measures affect daily life across the region. Schools up to Class 5 must offer hybrid classes where online attendance is feasible. Governments may also require some offices to operate with half their staff onsite. Authorities have been directed to enforce the restrictions across Delhi-NCR.

An AQI of 382 means Delhi's air is classified as very poor under the categories used in the article. It is not merely a small rise above moderate pollution. The reading shows that pollution is already high and that authorities consider stronger controls necessary to prevent further deterioration.

The important threshold is 400. According to the article, crossing 400 places the air in the severe category. Delhi's overall AQI crossed that mark on Friday, while the report also described the reading as 382 when Stage 3 restrictions were implemented. This reflects a rapidly worsening situation or different reporting moments.

The categories guide government action. Near the severe threshold, authorities restrict construction, older vehicles and some activities in schools and offices. The article does not provide pollutant-by-pollutant readings, but it links the response to dust pollution and emissions across Delhi-NCR.

Stage 3 prohibits many construction and demolition tasks. These include excavation, filling, drilling, piling, demolition, brickwork, masonry, road construction, major repairs, painting, polishing, welding and cutting or grinding tiles and stones. Dusty material loading and movement on unpaved roads are also restricted.

Vehicle rules target BS-III petrol and BS-IV diesel or older light motor vehicles in Delhi and specified high-density districts. Delhi-registered BS-IV or older diesel medium goods vehicles are restricted, while similar outside-registered goods vehicles cannot enter Delhi. Schools through Class 5 must use hybrid classes where feasible.

Delhi-NCR governments may decide whether public, municipal and private offices operate with 50% staff onsite. The Central government may separately permit work from home. Projects involving metros, hospitals, highways, water supply and other listed services are exempt.

Construction creates dust through excavation, drilling, demolition, brickwork, roadwork and cutting materials. The article specifically describes the Stage 3 restrictions as an effort to curb dust pollution across Delhi-NCR. It also controls the loading and movement of cement, sand, bricks, fly ash and crushed stone, which can release dust.

Vehicles are the second major target. Older petrol and diesel vehicles are restricted because the plan focuses on emissions from vehicles with older BS standards. The article's related reference also identifies vehicular emissions as a major contributor to Delhi-NCR air pollution. Stopping certain vehicles from travelling or entering Delhi reduces a source of emissions.

This combined approach matters because pollution comes from more than one activity. Construction controls reduce dust at sites and during transport, while vehicle rules address traffic emissions. The restrictions remain in force as authorities respond to very poor and potentially severe air quality.

For residents, Stage 3 can change travel, schooling and access to construction areas. People using restricted older vehicles cannot drive in Delhi or specified NCR districts. Children through Class 5 may attend lessons online instead of physically, where that option is feasible. Guardians and students choose the online option.

Workers and businesses in affected construction activities must pause excavation, demolition, masonry, roadwork and several finishing tasks. Material transport on unpaved roads is also prohibited. Public, municipal and private offices may operate with half their staff onsite, with the rest working from home, if governments choose that arrangement.

Public services do not all stop. Projects involving metros, hospitals, highways, roads, power transmission, telecommunications, sewage treatment and water supply are exempt. Authorities must enforce the rules across Delhi-NCR. The article does not quantify job losses, business costs or health outcomes, so those effects cannot be measured from this report.

Stage 3 is meant to reduce pollution, not stop every construction project. Some infrastructure is treated as essential because delays could affect transport, healthcare, public safety, utilities or national security. The article therefore exempts listed projects while imposing strict controls on ordinary dusty construction.

Exemptions cover railways, metro services, airports, interstate bus terminals, national security and defence, hospitals, highways, roads, flyovers, power transmission, pipelines, telecommunications, sewage treatment plants and water supply. These projects may continue despite the broader construction ban. Other lower-pollution work can also continue if it follows dust-control and waste-management rules.

The approach creates a selective restriction. Activities judged to generate substantial dust are stopped, while essential or comparatively cleaner work proceeds under compliance requirements. Authorities are still directed to enforce the restrictions across Delhi-NCR. The article does not provide a separate approval process or a timetable for the exemptions.

Particulate matter is made of tiny airborne particles from sources such as dust and combustion. More particles generally worsen air quality and push the AQI upward. The article identifies construction dust and vehicle emissions as important targets, but it does not give readings for specific particles such as PM2.5 or PM10.

Weather affects how pollution behaves. Calm conditions can allow emissions and dust to remain concentrated, while stronger air movement can disperse them. The article does not report the weather conditions during this episode, so their exact contribution cannot be established from the text. The AQI combines pollution measurements into a category such as very poor or severe.

Engine standards add another layer. BS-III petrol and BS-IV diesel vehicles, or older ones, face restrictions under Stage 3. Newer standards generally require tighter emissions controls, but the article focuses on the restrictions rather than comparing emission rates. Together, pollution levels and official thresholds trigger escalating responses.