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GRAP Stage-I invoked as Delhi air turns poor

The CAQM sub-committee switches on all 31 first-tier curbs across the National Capital Region after Delhi's daily-average AQI reads 226, entering the 'Poor' band.

What happened

On 16 April 2026 the sub-committee of the Commission for Air Quality Management in NCR and Adjoining Areas (CAQM) invoked all actions under Stage-I of the Graded Response Action Plan (GRAP) with immediate effect across the entire NCR.
The trigger: Delhi's daily-average Air Quality Index (AQI) recorded 226, placing it in the 'Poor' category (AQI band 201–300), as per the daily AQI Bulletin of the Central Pollution Control Board (CPCB).
Weather and air-quality forecasts from the India Meteorological Department (IMD) and the Indian Institute of Tropical Meteorology (IITM), Pune indicated the AQI was likely to stay in 'Poor' over the following two days, prompting the pre-emptive invocation.
The sub-committee directed implementation of all 31 Stage-I actions NCR-wide and urged the public to follow the Stage-I Citizen Charter.
Enforcement and monitoring rest with the Pollution Control Boards of the NCR States and the Delhi Pollution Control Committee (DPCC).

Background & context

GRAP is not a fresh announcement but a standing emergency framework. It is a set of graded, pre-decided anti-pollution measures for Delhi-NCR that escalate as air quality worsens, so that the response is automatic and forecast-driven rather than reactive. The plan was first notified by the Environment Ministry in 2017 and was later revised by CAQM to make it anticipatory — actions are now triggered on the basis of AQI forecasts from IMD and IITM, typically up to three days ahead, instead of waiting for pollution to peak. The intent is that curbs land before, not after, an episode builds.

The body that operates GRAP, CAQM, sits at the centre of this story. The Commission was first created by an Ordinance in 2020 and then placed on a permanent statutory footing through the Commission for Air Quality Management in National Capital Region and Adjoining Areas Act, 2021 (the CAQM Act, 2021). It superseded the earlier Environment Pollution (Prevention and Control) Authority (EPCA), which the Supreme Court had set up. CAQM is the single overarching authority for air-quality coordination across the NCR airshed — Delhi plus the adjoining districts of Haryana, Uttar Pradesh and Rajasthan — and its directions override those of individual State boards where there is a conflict. Crucially, GRAP's stage-wise actions are invoked by a sub-committee of CAQM, which is why a single commission decision can bind every NCR State at once. The framework deals with the winter and post-monsoon pollution that builds from a mix of vehicular emissions, construction dust, industrial output, biomass and crop-residue burning, and the region's adverse meteorology (calm winds and temperature inversion that trap pollutants).

For Prelims

Entity (the trigger): CAQM sub-committee on GRAP invoked Stage-I across NCR on 16 April 2026.
Index used: the National AQI, a CPCB index that converts concentrations of eight pollutants (PM2.5, PM10, NO₂, SO₂, CO, O₃, NH₃ and Pb) into a single 0–500 number across six categories — Good (0–50), Satisfactory (51–100), Moderate (101–200), Poor (201–300), Very Poor (301–400) and Severe (401–500).
Trigger value: Delhi's daily-average AQI 226, i.e. the 'Poor' band (201–300).
Statutory basis of the authority: CAQM is a statutory body under the CAQM Act, 2021 — its permanent legal foundation, not a temporary executive order.
What GRAP Stage-I covers: 31 actions including dust mitigation at Construction & Demolition (C&D) sites; mandatory dust controls for projects with plot size ≥500 sqm; regular lifting of municipal solid, C&D and hazardous waste; mechanised road sweeping and water sprinkling; anti-smog guns at C&D sites; a ban on open burning of biomass and MSW; PUC (Pollution Under Control) enforcement; action against over-aged diesel/petrol vehicles; controls on industries, brick kilns and hot-mix plants; a ban on firecrackers; a ban on coal and firewood in tandoors; and augmented CNG/electric bus and metro frequency.
Forecast inputs: IMD and IITM (Pune) supply the air-quality and weather forecasts on which invocation decisions rest.
Enforcement chain: CAQM sub-committee directs → State Pollution Control Boards of NCR States and the DPCC implement and monitor on the ground.

For Prelims — the full GRAP stage set

The high-value Prelims fact is the mapping of GRAP's four stages to AQI bands and the headline action at each level. Carry the full set so a "how many / which of these" or "match the pairs" question is survivable.

Stage	AQI category	AQI range	Headline action
Stage-I	Poor	201–300	Dust control at C&D sites, anti-smog guns, ban on open biomass/MSW burning, PUC checks
Stage-II	Very Poor	301–400	Intensified parking fees, augmented public transport, regulated DG-set use, mechanised sweeping
Stage-III	Severe	401–450	Ban on most C&D activity, restrictions on BS-III petrol / BS-IV diesel four-wheelers, brick-kiln/stone-crusher curbs
Stage-IV	Severe+	above 450	Entry ban on most trucks, stoppage of all C&D including public projects, possible school closures and work-from-home

For UPSC: GRAP Stage-I = 'Poor' AQI (201–300), all 31 actions; CAQM is a statutory body under the CAQM Act, 2021; the four GRAP stages map to AQI bands Poor → Very Poor → Severe → Severe+; forecasts come from IMD and IITM, enforcement from State PCBs and DPCC.

What it is NOT: GRAP is not an Act and not a permanent ban — it is a graded, forecast-triggered action plan that switches on and off with AQI. CAQM is not a body resting on the Environment Ministry's executive order any more — that was EPCA, which CAQM replaced; CAQM today is statutory under the CAQM Act, 2021. The AQI is not a measure of a single pollutant — it aggregates eight. And Stage-I is the lowest tier ('Poor'), not the emergency one (that is Stage-IV, 'Severe+').

Why it matters

Delhi-NCR has among the worst urban air in the world during its pollution season, and the public-health cost — respiratory and cardiovascular illness, lost school and work days, premature deaths — is large and recurring. The significance of this invocation is the shift from reactive to anticipatory governance: because CAQM acts on a forecast rather than waiting for the air to turn 'Severe', curbs can blunt an episode while it is still building. It also matters institutionally. An AQI of 226 in mid-April is notable because the 'Poor' band is more typically a winter problem; an April invocation underlines that NCR air quality is a year-round management task, not only a post-Diwali one, with dust, construction and heat-driven ozone in the warmer months adding to the winter mix of crop-residue smoke and vehicular load.

The deeper problem GRAP addresses is the airshed character of pollution: pollutants do not respect State boundaries, so Delhi alone cannot fix its air. By having one statutory commission invoke uniform actions across Delhi and the adjoining areas of Haryana, Uttar Pradesh and Rajasthan at the same instant, GRAP and CAQM together attempt to solve the classic coordination failure of multiple agencies and States each controlling only a slice of a single airshed. That said, GRAP is by design a short-term emergency response, not a structural fix — it manages crises rather than removing the underlying sources, which is why it recurs every season.

How CAQM compares to what came before

The exam value of CAQM is sharpest against its predecessor, because the two are a common confusion. The earlier authority for NCR air was the Environment Pollution (Prevention and Control) Authority (EPCA), constituted in 1998 on the directions of the Supreme Court. EPCA was a court-mandated body with a narrow mandate. CAQM, by contrast, was created first by Ordinance in 2020 and then by Parliament through the CAQM Act, 2021 — so its authority flows from statute, not from a court order. CAQM is also wider in reach and powers: it can issue binding directions, lay down parameters for air quality, coordinate across States, and impose penalties, with its directions prevailing over those of State boards in case of conflict. When CAQM was set up, EPCA was dissolved. So the safe one-line distinction is: EPCA = Supreme-Court-constituted (1998), now defunct; CAQM = statutory under the CAQM Act, 2021, the current authority. The Commission is chaired by a full-time chairperson and includes members and representatives from the Centre and the NCR States, drawing in CPCB, ISRO and other technical bodies — a structure built to act on the whole airshed rather than one city.

How the AQI itself is built

Because the AQI is the switch that turns GRAP on, the index deserves its own note. India's National Air Quality Index was launched by CPCB in 2015 under the "One Number, One Colour, One Description" idea, so that a single figure communicates air quality to the public. It folds eight pollutants — PM2.5, PM10, nitrogen dioxide (NO₂), sulphur dioxide (SO₂), carbon monoxide (CO), ground-level ozone (O₃), ammonia (NH₃) and lead (Pb) — into one sub-index each, and the worst (highest) sub-index becomes the overall AQI. A minimum number of pollutants must be monitored for a valid AQI, and PM2.5 or PM10 is almost always the driver in Delhi-NCR. The six bands run Good, Satisfactory, Moderate, Poor, Very Poor and Severe, each with its own colour and health advisory. The key contrast for Prelims: the AQI is not a simple average and not a single-pollutant reading — it is the worst of eight sub-indices, which is why a high particulate load alone can push the whole index into the 'Poor' or worse bands.

For Mains

Data

A concrete, datable example for air-pollution and environmental-governance answers: Delhi AQI 226 ('Poor') on 16 April 2026 triggering CAQM's invocation of all 31 GRAP Stage-I actions across NCR — usable to evidence the scale and recurrence of the problem.

Exemplification

A clean illustration of forecast-based, escalating environmental regulation and of cooperative airshed governance through a single statutory body (CAQM) binding four States at once — the model answer to "how should multi-State environmental problems be governed?"

Problematisation

GRAP, by its own design, is an emergency stop-gap that switches on and off with AQI; it manages episodes but does not dismantle the structural sources (construction dust, vehicles, industry, crop-residue burning). This gap — crisis management versus source reduction — is itself the analytical hook for a critique of India's urban-air strategy.

Anchor

Can anchor a question framed directly on the institutional architecture of air-quality management in NCR — CAQM's statutory powers under the 2021 Act, its supersession of EPCA, and GRAP as its operational instrument.

Way-forward

Points toward what GRAP cannot do: year-round source-control (cleaner fuels and transport, dust management, stubble-burning alternatives, airshed-level planning) as the permanent complement to the seasonal emergency plan.

Deploys into: GS3.14 (conservation, environmental pollution and degradation, EIA) as the lead tag, with GS2.9 (statutory and regulatory bodies) for the CAQM-as-institution angle — i.e. urban air-pollution governance, airshed coordination, and the role of statutory regulatory bodies.

Ministry of Environment, Forest and Climate Change · 2026-04-16 · PRID 2252727 · PIB source ↗

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