Permanent project revision

Delhi Smog Towers, Connaught Place & Anand Vihar

Revision 2026-08-20-source-dates-b2 · effective 2026-07-26

Superseded. A later revision exists: 2026-08-26-claim-mapping →

unreviewed

Record the publication date of each source that states one; sources that publish no date are marked null.

sha256:14ee41ff9643e9be3e34bf78c83f232e822d913919f90a358bfa9715215356e0

All revisions → Current entity page →

Change set

replace /snapshot/projectFingerprint — Updated projectFingerprint to the current sourced project record.
replace /snapshot/sources — Updated sources to the current sourced project record.

1: of 1 claims mapped
8: source dossiers
7: publication dates recorded
1: archives linked
0: exact locators
0: content captures hashed

Claims, one by one

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-74a60afa911bfb73 quantitative

The Delhi Pollution Control Committee told the National Green Tribunal in 2023 that, on IIT-Bombay's measured 12-13% reduction within a 110-200 m radius, about 40,000 such towers would be needed to cut pollution across Delhi's 1,483 km2 by 17%

Published field: impact · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: The DPCC's submission to the NGT builds on IIT-Bombay's measured reduction radius.
Caveat: The IIT-Bombay evaluation was stopped when funding for the Connaught Place tower was cut in 2023, and the central board maintains the Anand Vihar tower still runs.

Sources carrying this claim

Down To Earth — Smog towers ineffective, at least 40,000 needed in Delhi: DPCC tells NGT

Source dossiers and revision state

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 2026-08-20-source-dates-b2 effective 2026-07-26 · created 2026-08-20

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

sha256:14ee41ff9643e9be3e34bf78c83f232e822d913919f90a358bfa9715215356e0

Revision history → Permanent version link → Machine-readable record → Evidence Constitution →

1: of 1 claims mapped
8: source dossiers
7: publication dates recorded
1: archives linked
0: exact locators
0: content captures hashed

Governance facts carried by the record

Operator: Delhi Pollution Control Committee (Connaught Place); Central Pollution Control Board, operations and maintenance by Tata Projects (Anand Vihar)
Actor types: city-government, national-government, private
Funding model: public
Funding description: Delhi government (Connaught Place) and Government of India / CPCB (Anand Vihar)
Cost: about 20 crore rupees per tower (~US$2.5M)
Ownership: Not recorded
Decision rights: Not recorded
Exit conditions: Not recorded

8 source dossiers

Al Jazeera — New Delhi opens first 'smog tower'; expert says 'absolute waste' aljazeera.com · background

Open original source ↗

Stable source ID: src-6dc44387a0cb7f10
Publisher: Name not classified · aljazeera.com
Type / language: web-page · language not classified
Published: 2021-08-23
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
23 Aug 2021 inauguration; 40 fans processing 1,000 m3/s claimed to halve particulates within a 1 km2 radius; CEEW's Karthik Ganesan calls it 'futile, an absolute waste'.
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

ThePrint — Delhi has two smog towers, but here's why they are unlikely to help theprint.in · background

Open original source ↗

Stable source ID: src-f572888ad11c48e7
Publisher: Name not classified · theprint.in
Type / language: web-page · language not classified
Published: 2021-10-14
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
14 Oct 2021. Both towers: 24 m, 20 crore rupees each, 40 fans, 5,000 HEPA filters, University of Minnesota design modified by IIT-Bombay and IIT-Delhi. Connaught Place operational 22 Sep 2021; Anand Vihar inaugurated 7 Sep 2021.
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

ThePrint — Connaught Place smog tower shuts down amid pollution crisis theprint.in · background

Open original source ↗

Stable source ID: src-11a42ba184578697
Publisher: Name not classified · theprint.in
Type / language: web-page · language not classified
Published: 2023-11-03
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
3 Nov 2023. The DPCC chairman halted release of operations and maintenance funds to IIT-Bombay and other agencies, ending the commissioned two-year impact study.
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

LiveLaw — Supreme Court summons DPCC chairperson over non-functional smog towers livelaw.in · background

Open original source ↗

Stable source ID: src-cbcaea26f96a136d
Publisher: Name not classified · livelaw.in
Type / language: web-page · language not classified
Published: 2023-11-07
Updated: 2023-11-16
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
7 Nov 2023. In M.C. Mehta v. Union of India the Court called it 'ludicrous that smog towers aren't working' and summoned the DPCC chairperson.
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

Down To Earth — Smog towers ineffective, at least 40,000 needed in Delhi: DPCC tells NGT downtoearth.org.in · 1 linked claim

Open original source ↗

Stable source ID: src-e9e2525bb7274192
Publisher: Name not classified · downtoearth.org.in
Type / language: web-page · language not classified
Published: 2023-11-16
Updated: 2024-04-22
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: Open archived copy ↗ · 2026-04-16
Content hash: No captured content hash
Locator: Open the recorded source note
16 Nov 2023. Carries the impact figure: DPCC, citing an IIT-Bombay report showing 12-13% reduction within a 109-199 m radius, told the NGT that about 40,000 towers would be needed to cut pollution across Delhi's 1,483 km2 by 17%.
Descriptive only — not page/paragraph exact
Claims linked: clm-74a60afa911bfb73

Down To Earth — Delhi's smog tower remains useless in peak pollution season downtoearth.org.in · background

Open original source ↗

Stable source ID: src-4a849565bcdb803b
Publisher: Name not classified · downtoearth.org.in
Type / language: web-page · language not classified
Published: 2024-11-06
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
6 Nov 2024. Connaught Place tower remains defunct more than a year on.
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

The Tribune — CPCB claims Anand Vihar smog tower cuts bad air by 20% tribuneindia.com · background

Open original source ↗

Stable source ID: src-52c3786a6f35c63f
Publisher: Name not classified · tribuneindia.com
Type / language: web-page · language not classified
Published: 2025-11-20
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-20
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
20 Nov 2025 — strongest recent source. CPCB RTI reply: Anand Vihar tower fully operational, up to 20% reduction within 200-400 m; Connaught Place tower non-functional. Notes media reports contradicting CPCB's operational claim.
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

Guttikunda & Jawahar — Can We Vacuum Our Air Pollution Problem Using Smog Towers?, Atmosphere 11(9):922 (2020) mdpi.com · background

Open original source ↗

Stable source ID: src-644d29f30a092a75
Publisher: Name not classified · mdpi.com
Type / language: web-page · language not classified
Published: Not recorded
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-07-26
Dossier created: 2026-08-20
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 pre-construction critique: a Delhi-scale pilot tower filters about 0.00002% of the winter airshed. 'With no boundaries, it is unscientific to assume that one can trap air, clean it, and release into the same atmosphere simultaneously.'
Descriptive only — not page/paragraph exact
Claims linked: Background source; no baseline claim points here

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.