1001 Smart Cities
🇮🇳 New Delhi

GRAP: Air Quality Readings as a Legal Trigger

🤖 AI-generated summary · ◆ 8 sourced claims · 🔎 Last verified

This overview was generated with AI from the public sources listed below and checked against them before publication. It has not had a complete human fact-check — treat it as a starting point and follow the sources.

8 sourced claims on this page, none individually verified yet — turn on “Sources in the text” to see each one.

How this atlas is made · What “last verified” means · What “source-checked” means · The full record behind this page

✎ Corrected 27 Aug 2026 Record revised. · 3 revisions in all What changed →

Since 2017 an air-quality number has carried legal force here, halting construction and freight when it crosses a line. In 2025 the stages were invoked only after the air had worsened, 13 times in 17.

Outcome🔄 Ongoing
Evidence📊 Independent
what does this mean?The strongest source is an independent non-academic evaluation: an audit office, a government or EU review, or an NGO. It grades who did the looking — not how well the project went. All four grades →
Run byCommission for Air Quality Management in NCR and Adjoining Areas (CAQM); monitoring network run by Delhi Pollution Control Committee, Central Pollution Control Board, IMD and IITM
Scale🗺️ Regional

Part of 1001 Smart Cities — 1,167 documented projects · 🏙️ 9 more in New Delhi · 🌫️ Air quality guide · 🌱 Environment projects

About 40 continuous monitoring stations run by Delhi's pollution control committee, the central board and national research institutes feed an hourly Air Quality Index that is published publicly and through the SAMEER app. Since 2017 that number has legal force: under the Graded Response Action Plan, defined AQI thresholds trigger escalating curbs across the capital region, from construction and diesel-generator bans to restrictions on older vehicles, freight entry and in-person schooling. A later revision extended the trigger to the forecast, so a stage can be invoked when the AQI is merely expected to cross a threshold under the dynamic model and the IMD/IITM weather forecast, and the Commission for Air Quality Management tightened the schedule again in November 2025. Independent reviewers find the mechanism reactive in practice, and Delhi's monitors have been accused of being sprayed with water or dropping offline at peak pollution.

Live 📅 since 2017

📊 Impact

In 2025, GRAP stages were invoked only after the AQI had already climbed past the threshold on 13 of 17 occasions (CEEW analysis).

🎓 Lesson

Delhi is the rare case where a reading is the trigger and not a warning, and it shows what the top rung costs. A threshold that fires by itself is only as early as the number it watches: extending it to the forecast was the right repair, and in 2025 the stages were still invoked after the air had already gone bad on 13 of 17 occasions. And the moment a number carries legal force, the number itself becomes worth attacking — reporters found a public works tanker spraying water around the monitor in Jahangirpuri while the dust and debris beside it went untouched.

🌱 EnvironmentAir qualitySensors & IoTOpen dataHealth & care

Sources

↗ CAQM — Graded Response Action Plan schedule (official document)The Commission's own GRAP schedule as a PDF: the four stages, their AQI bands and the measures each stage triggers. The document states no publication date.
↗ PIB — CAQM revises GRAP schedule, making it more stringent (22 Nov 2025)Most recent revision: measures moved into earlier stages. Confirms the regime is active and being tightened.
↗ PIB — CAQM invokes a 9-point Stage-III action plan across the NCR (11 Nov 2025)A worked example of the trigger firing: AQI of 425 recorded at 9 AM, Stage-III restrictions imposed the same day by the CAQM GRAP sub-committee.
↗ Government of NCT of Delhi, Department of Environment — Ambient Air QualityDelhi environment department page on ambient air quality. No publication date is recorded: the page could not be retrieved when this entry was checked, so nothing about its content is asserted here beyond the department's own description of the page in its navigation.
↗ data.gov.in — SAMEER (National Air Quality Index), CPCBThe government open-data catalogue entry for the SAMEER national AQI feed. A continuously maintained catalogue page, so it states no publication date.
Show 5 more sourcesShow fewer
↗ Ravish — Stage-wise evaluation of GRAP under meteorological constraints in Delhi-NCR, Discover Atmosphere (2026)Published 15 April 2026Peer-reviewed. Finds Stage I and II show measurable improvement but Stage III and IV little; concludes GRAP gives limited, meteorology-dependent short-term relief limited by reactive activation.
↗ CEEW — How can GRAP deliver more sustained improvement in air quality? (21 May 2026)Independent analysis, published 21 May 2026, carrying the count of late invocations and the argument for acting on forecasts rather than on measured exceedances.
↗ Newslaundry — Delhi AQI 'fraud': water sprinklers cleaning the data, not the air (30 Oct 2025)Reporters observed PWD tankers repeatedly watering the ground around monitors at Jahangirpuri and Anand Vihar; earlier reporting found stations sited behind trees and walls, against placement norms.
↗ PIB — CAQM announces a revision of the GRAP for the NCR winter (28 Jul 2023)Government release on the revised GRAP: actions are triggered when Delhi’s AQI goes beyond a threshold or is expected to go beyond it under the dynamic model and the IMD/IITM meteorological forecast.
↗ PRS Legislative Research — Commission for Air Quality Management in NCR and Adjoining Areas Act, 2021 (full text)Published 2021Full text of the Act that constitutes the Commission administering GRAP. Replaces the India Code link for the same Act, which now returns 404.

📅 How old is the evidence?

Two clocks, kept apart: when this entry’s sources were published, and what has happened to its record in the atlas. Documented span: since 2017. 7 of 10 sources carry a publication date, from 2021 to 21 May 2026.

When the sources were published

  1. PRS Legislative Research · researchPRS Legislative Research — Commission for Air Quality Management in NCR and Adjoining Areas Act, 2021 (full text)
  2. Press Information Bureau, Government of India · national governmentPIB — CAQM announces a revision of the GRAP for the NCR winter (28 Jul 2023)
  3. Newslaundry · pressNewslaundry — Delhi AQI 'fraud': water sprinklers cleaning the data, not the air (30 Oct 2025)
  4. Press Information Bureau, Government of India · national governmentPIB — CAQM invokes a 9-point Stage-III action plan across the NCR (11 Nov 2025)
  5. Press Information Bureau, Government of India · national governmentPIB — CAQM revises GRAP schedule, making it more stringent (22 Nov 2025)
  6. Springer · researchRavish — Stage-wise evaluation of GRAP under meteorological constraints in Delhi-NCR, Discover Atmosphere (2026)
  7. Council on Energy, Environment and Water (CEEW) · ngoCEEW — How can GRAP deliver more sustained improvement in air quality? (21 May 2026)

Every source, with links ↑

What happened to this record

  1. Publication date recorded for 1 source
  2. Entered the record
  3. 2 sources added
  4. Record revised
  5. Sources last read

Every revision, permanent →

Show your work What this page rests on and what it can’t tell you · all 8 claims with their sources · the forensic record

Evidence Passport · public beta 8 addressable claims, 10 source dossiers, one permanent baseline. The passport is unreviewed — an AI-assisted structural migration, not a human or expert endorsement. Every revision keeps a permanent copy under revision history.

Inspect the claims, one by one — verbatim text, sources and caveats for all 8

The text below is copied verbatim from the published record. Each claim names the source dossiers that carry it; caveats stay attached to the claim they qualify.

Claim 1 clm-7cea4b70c6b189f6 quantitative
About 40 continuous monitoring stations run by Delhi's pollution control committee, the central board and national research institutes feed an hourly Air Quality Index that is published publicly and through the SAMEER app
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The Delhi environment department's ambient air quality page lists the continuous monitoring stations and their operators; the national open-data catalogue entry describes the SAMEER national AQI feed published by the Central Pollution Control Board.
Caveat
The Delhi department's host resets the connection for automated retrieval, so no locating passage could be read from it.

Sources carrying this claim

  1. Government of NCT of Delhi, Department of Environment — Ambient Air Quality
  2. data.gov.in — SAMEER (National Air Quality Index), CPCB
Claim 2 clm-e4567f923d423287 quantitative
Since 2017 that number has legal force: under the Graded Response Action Plan, defined AQI thresholds trigger escalating curbs across the capital region
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The Commission's own GRAP schedule sets out the AQI bands and the measures each stage brings into force; the peer-reviewed stage-wise evaluation covers the plan's operation since its introduction.
Caveat
Both hosts block automated retrieval — the Commission's site serves its application shell, the publisher its paywall page — so no locating passage was read from either.

Sources carrying this claim

  1. CAQM — Graded Response Action Plan schedule (official document)
  2. Ravish — Stage-wise evaluation of GRAP under meteorological constraints in Delhi-NCR, Discover Atmosphere (2026)
Claim 3 clm-650d45388338575a descriptive
A later revision extended the trigger to the forecast, so a stage can be invoked when the AQI is merely expected to cross a threshold under the dynamic model and the IMD/IITM weather forecast
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Government release on the revised GRAP: actions are taken when Delhi's AQI goes beyond a certain threshold or is expected to go beyond it, per the dynamic model and the meteorological forecast supplied by IMD and IITM.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. PIB — CAQM announces a revision of the GRAP for the NCR winter (28 Jul 2023)
Claim 4 clm-8c72c75f2bd87fdb quantitative
the Commission for Air Quality Management tightened the schedule again in November 2025
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Government release of 22 November 2025: the Commission revised the GRAP schedule on 21 November 2025, moving several Stage II measures into Stage I. The Act establishes the Commission that administers the plan.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. PIB — CAQM revises GRAP schedule, making it more stringent (22 Nov 2025)
  2. PRS Legislative Research — Commission for Air Quality Management in NCR and Adjoining Areas Act, 2021 (full text)
Claim 5 clm-14dfc3297d66dc89 descriptive
Delhi's monitors have been accused of being sprayed with water or dropping offline at peak pollution
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Independent report of 30 October 2025: in Jahangirpuri a public works tanker sprayed water around the air monitor while the debris and dust around the spot remained untouched.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Newslaundry — Delhi AQI 'fraud': water sprinklers cleaning the data, not the air (30 Oct 2025)
Claim 6 clm-a6ef3f1662b5b995 quantitative
In 2025, GRAP stages were invoked only after the AQI had already climbed past the threshold on 13 of 17 occasions (CEEW analysis)
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
CEEW, 21 May 2026, verbatim: 'In fact, in 2025, on 13 out of 17 occasions, GRAP stages were invoked only after the AQI had climbed well past the threshold for that specific stage.'
Caveat
CEEW states the count and links it to reporting by ThePrint rather than to a dataset of its own.

Sources carrying this claim

  1. CEEW — How can GRAP deliver more sustained improvement in air quality? (21 May 2026)
  2. PIB — CAQM invokes a 9-point Stage-III action plan across the NCR (11 Nov 2025)
Claim 7 clm-4f72c6560b841803 quantitative
extending it to the forecast was the right repair, and in 2025 the stages were still invoked after the air had already gone bad on 13 of 17 occasions
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
CEEW, 21 May 2026, verbatim: 'In fact, in 2025, on 13 out of 17 occasions, GRAP stages were invoked only after the AQI had climbed well past the threshold for that specific stage.'
Caveat
CEEW states the count and links it to reporting by ThePrint rather than to a dataset of its own.

Sources carrying this claim

  1. CEEW — How can GRAP deliver more sustained improvement in air quality? (21 May 2026)
  2. PIB — CAQM announces a revision of the GRAP for the NCR winter (28 Jul 2023)
Claim 8 clm-82f4d012257980bc descriptive
reporters found a public works tanker spraying water around the monitor in Jahangirpuri while the dust and debris beside it went untouched
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Independent report of 30 October 2025, describing exactly that scene.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Newslaundry — Delhi AQI 'fraud': water sprinklers cleaning the data, not the air (30 Oct 2025)
Forensic record — source dossiers, gaps, hashes and the exact revision this page renders

This layer records what is known about each source, what is still missing, and the exact snapshot this page is rendering. A missing date, archive or hash stays visible as missing.

unreviewed Revision 2026-08-27-correction-run effective 2026-08-27 · created 2026-08-27

Awaiting operator and domain-expert review; publication of this revision implies neither.

sha256:7efe677ebe7a03ae7e0679c5226dca333ee1a83ef37268f90898af7698935c67
Revision history → Permanent version link → Machine-readable record → Evidence Constitution →
8
of 8 claims mapped
10
source dossiers
6
publication dates recorded
0
archives linked
0
exact locators
0
content captures hashed

Governance facts carried by the record

Operator
Commission for Air Quality Management in NCR and Adjoining Areas (CAQM); monitoring network run by Delhi Pollution Control Committee, Central Pollution Control Board, IMD and IITM
Actor types
national-government, city-government, research
Funding model
public
Funding description
Not recorded
Cost
Not recorded
Ownership
Not recorded
Decision rights
Not recorded
Exit conditions
Not recorded

10 source dossiers

CAQM — Graded Response Action Plan schedule (official document) caqm.nic.in · 1 linked claim

Open original source ↗

Stable source ID
src-6b8cccbc2b5d562d
Publisher
Name not classified · caqm.nic.in
Type / language
pdf · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-27
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

The Commission's own GRAP schedule as a PDF: the four stages, their AQI bands and the measures each stage triggers. The document states no publication date.

Descriptive only — not page/paragraph exact
Claims linked
PIB — CAQM revises GRAP schedule, making it more stringent (22 Nov 2025) pib.gov.in · 1 linked claim

Open original source ↗

Stable source ID
src-1df5e0db1641f943
Publisher
Name not classified · pib.gov.in
Type / language
web-page · language not classified
Published
2025-11-22
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-27
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Most recent revision: measures moved into earlier stages. Confirms the regime is active and being tightened.

Descriptive only — not page/paragraph exact
Claims linked
PIB — CAQM invokes a 9-point Stage-III action plan across the NCR (11 Nov 2025) pib.gov.in · 1 linked claim

Open original source ↗

Stable source ID
src-52d2ac68935cba3d
Publisher
Name not classified · pib.gov.in
Type / language
web-page · language not classified
Published
2025-11-11
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-27
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

A worked example of the trigger firing: AQI of 425 recorded at 9 AM, Stage-III restrictions imposed the same day by the CAQM GRAP sub-committee.

Descriptive only — not page/paragraph exact
Claims linked
Government of NCT of Delhi, Department of Environment — Ambient Air Quality environment.delhi.gov.in · 1 linked claim

Open original source ↗

Stable source ID
src-0c68ecb2bf3d340e
Publisher
Name not classified · environment.delhi.gov.in
Type / language
web-page · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-27
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Delhi environment department page on ambient air quality. No publication date is recorded: the page could not be retrieved when this entry was checked, so nothing about its content is asserted here beyond the department's own description of the page in its navigation.

Descriptive only — not page/paragraph exact
Claims linked
data.gov.in — SAMEER (National Air Quality Index), CPCB data.gov.in · 1 linked claim

Open original source ↗

Stable source ID
src-984d07f3f118de2f
Publisher
Name not classified · data.gov.in
Type / language
web-page · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-27
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

The government open-data catalogue entry for the SAMEER national AQI feed. A continuously maintained catalogue page, so it states no publication date.

Descriptive only — not page/paragraph exact
Claims linked
Ravish — Stage-wise evaluation of GRAP under meteorological constraints in Delhi-NCR, Discover Atmosphere (2026) link.springer.com · 1 linked claim

Open original source ↗

Stable source ID
src-55a046bc2ef1a0c0
Publisher
Name not classified · link.springer.com
Type / language
web-page · language not classified
Published
2026-04-15
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-27
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Peer-reviewed. Finds Stage I and II show measurable improvement but Stage III and IV little; concludes GRAP gives limited, meteorology-dependent short-term relief limited by reactive activation.

Descriptive only — not page/paragraph exact
Claims linked
CEEW — How can GRAP deliver more sustained improvement in air quality? (21 May 2026) ceew.in · 2 linked claims

Open original source ↗

Stable source ID
src-2d015e486f342f87
Publisher
Name not classified · ceew.in
Type / language
web-page · language not classified
Published
2026-05-21
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-27
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Independent analysis, published 21 May 2026, carrying the count of late invocations and the argument for acting on forecasts rather than on measured exceedances.

Descriptive only — not page/paragraph exact
Claims linked
Newslaundry — Delhi AQI 'fraud': water sprinklers cleaning the data, not the air (30 Oct 2025) newslaundry.com · 2 linked claims

Open original source ↗

Stable source ID
src-47b937c11a0081ce
Publisher
Name not classified · newslaundry.com
Type / language
web-page · language not classified
Published
2025-10-30
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-27
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Reporters observed PWD tankers repeatedly watering the ground around monitors at Jahangirpuri and Anand Vihar; earlier reporting found stations sited behind trees and walls, against placement norms.

Descriptive only — not page/paragraph exact
Claims linked
PIB — CAQM announces a revision of the GRAP for the NCR winter (28 Jul 2023) pib.gov.in · 2 linked claims

Open original source ↗

Stable source ID
src-8a042af3cbd8544e
Publisher
Name not classified · pib.gov.in
Type / language
web-page · language not classified
Published
2023-07-28
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-27
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Government release on the revised GRAP: actions are triggered when Delhi’s AQI goes beyond a threshold or is expected to go beyond it under the dynamic model and the IMD/IITM meteorological forecast.

Descriptive only — not page/paragraph exact
Claims linked
PRS Legislative Research — Commission for Air Quality Management in NCR and Adjoining Areas Act, 2021 (full text) prsindia.org · 1 linked claim

Open original source ↗

Stable source ID
src-955b0d09c6f30471
Publisher
Name not classified · prsindia.org
Type / language
pdf · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-27
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Full text of the Act that constitutes the Commission administering GRAP. Replaces the India Code link for the same Act, which now returns 404.

Descriptive only — not page/paragraph exact
Claims linked
Known limits of this passport
  • Publisher names and source languages have not yet been classified; domains are recorded without guessing.
  • Existing source notes are descriptive locators, not page- or paragraph-exact citations.
  • A missing archive, publication date or content hash is shown as null rather than inferred.
  • The project-level evidence grade ranks the strongest source in the entry; it is not a truth score for every claim.

Continue exploring

Compare this project

🇮🇳 Delhi Smog Towers, Connaught Place & Anand Vihar · New Delhi Same air, two instruments: since 2017 the AQI reading triggers citywide bans; the 2021 towers tried to filter the air in place. 🇨🇳 High-density air-quality monitoring and source-apportionment network · Beijing Beijing's 1,000+ sensors guide targeted controls; Delhi's ~40 stations pull the legal trigger themselves once AQI crosses a stage. 🇲🇳 Ulaanbaatar Air Quality Monitoring Network · Ulaanbaatar Two smoggy capitals reading their air: Ulaanbaatar's 16 sites publish live AQI, Delhi's hourly index legally triggers bans.

Does the air reading have a consequence?

The same ladder that organises the flood systems in this atlas, applied to air. All four cities measure well. What separates them is whether a number is allowed to oblige anyone to do anything.

ProjectSinceStatusOutcomeEvidenceRun byCostWhat follows from the reading
GRAP: Air Quality Readings as a Legal TriggerNew Delhi, 🇮🇳 2017 Live Ongoing Independent National government, City government, Research institution not public The measurement obliges: an index crossing a fixed step brings legal duties into force by itself, from construction bans to school closures.
Critical Episode Management: A Next-Day Forecast With Legal ForceSantiago, 🇨🇱 1997 Live Ongoing Official National government, Regional government not public The threshold binds but the day is judged — an appointed regional authority signs the declaration, and it acts on a forecast of tomorrow rather than a reading of today.
Bangkok PM2.5 Monitoring & Graduated ResponseBangkok, 🇹🇭 2023 Live Ongoing Official City government not public The city can close its own schools on a reading, must borrow the disaster act to keep trucks out, and can only ask employers.
Court-Ordered Air Quality MonitoringJakarta, 🇮🇩 2021 Live Ongoing Independent City government not public A court ordered the network and the network was built — but no index value triggers anything at all.

Explore the wider context

📟 A Reading Is Not a Decision📖 Air quality index (AQI)📖 Low-emission zone📖 Open data
📎 Cite this project

1001 Smart Cities (2026). “GRAP: Air Quality Readings as a Legal Trigger” — New Delhi, India. The Smart City Atlas. https://1001smartcities.org/projects/delhi-grap-aqi-trigger/ (last verified 2026-08-27). Data: CC BY 4.0.

The underlying data is free to reuse with attribution — see the open data page.

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