PARLIAMENT QUESTION: ASSESSMENT OF CLOUD SEEDING IN DELHI

1. At a Glance

• Cloud seeding is a weather-modification technique that introduces nucleating agents (e.g., silver iodide, NaCl) into clouds to induce precipitation; Delhi is piloting it as an emergency air-pollution mitigation measure [S1][S2].
• The pilot — "Technology Demonstration and Evaluation of Cloud Seeding as an Alternative for Delhi NCR Pollution Mitigation" — is run by Department of Environment, GNCTD with IIT Kanpur [S1].
• Relevant to UPSC GS-III (Environment / S&T) and GS-II (Centre-State / urban governance) given air-quality crises in NCR.

2. Why in the News

• 05 Feb 2026: Ministry of Earth Sciences answered a Parliament Question stating GNCTD–IIT Kanpur pilot is at trial stage, with Rs 37,93,420 released as first installment [S1].
• Project approved by Cabinet Decision No. 3200 dated 10.05.2025 [S1].
• MoES clarified it is not the implementing ministry for the Delhi pilot — it is a GNCTD initiative [S1].

3. Background & Evolution

• 2010: High Altitude Cloud Physics Laboratory opened at Mahabaleshwar, Maharashtra under IITM [S2].
• 2017–2019: CAIPEEX (Cloud Aerosol Interaction and Precipitation Enhancement Experiment) Phase-IV carried out by IITM, Pune in the rain-shadow region of the Indian peninsula [S2].
• CAIPEEX produced India's first scientific guidelines for cloud seeding [S2].
• May 2025: Union Cabinet clears Delhi cloud-seeding pilot [S1].
• 2025–26: Trial flights/operations under IIT Kanpur execution [S1].

4. Core Static Facts

• Pilot name: "Technology Demonstration and Evaluation of Cloud Seeding as an Alternative for Delhi NCR Pollution Mitigation" [S1].
• Implementing State agency: Department of Environment, GNCTD [S1].
• Technical partner: IIT Kanpur [S1].
• Cabinet approval: Decision No. 3200, 10 May 2025 [S1].
• First installment released: Rs 37,93,420 [S1].
• Stated objective: emergency relief during episodic high air-pollution events when conducive cloud cover is present [S1].
• Union Ministry posture: MoES is not the implementing ministry [S1].
• National research lead (separate from Delhi pilot): IITM Pune under MoES, via CAIPEEX [S2].
• CAIPEEX results: rainfall enhancement up to 46 ± 13% locally and 18 ± 2.6% on average over 100 sq km downwind; ~867 million litres of water added; positive cost-benefit ratio [S2].

5. Multi-Dimensional Analysis

Environmental - Aims at wet deposition of PM2.5/PM10 during winter smog; effect is transient (hours-days) and contingent on cloud microphysics [S1]. - Use of silver iodide / hygroscopic salts raises questions of soil/water residues — no Indian standard yet [S1].

Scientific / Technological - Requires supercooled or warm cumulus clouds with sufficient liquid water content; Delhi winter inversions often produce shallow stratus, limiting seedability [S1]. - CAIPEEX validated hygroscopic seeding efficacy in Indian context [S2].

Administrative / Federalism - Sharp Centre-State split: GNCTD funds and contracts; MoES (Union) explicitly disclaims implementing role [S1]. - Requires DGCA flight clearances, MoD/IAF airspace clearance, IMD nowcasting — multi-agency dependency [S1].

Ethical / Governance - Concerns over downwind equity (precipitation displacement), transparency of trial protocols, and use of public funds on an unproven emergency tool [S1].

Economic - Cost so far modest (₹37.9 lakh first installment); cost-effectiveness vs. GRAP, odd-even, mechanical sweeping uncertain [S1].

6. Recent Developments (last 12-18 months)

• 10 May 2025: Cabinet Decision No. 3200 approves Delhi pilot [S1].
• 2025: First installment of ₹37.93 lakh paid to IIT Kanpur [S1].
• 05 Feb 2026: PIB release confirming trial stage status and MoES non-implementing role [S1].

7. Prelims Hooks

• Delhi cloud-seeding pilot executed by IIT Kanpur (not IIT Delhi, not IITM Pune) [S1].
• Cabinet Decision No. 3200 / 10.05.2025 approved the project [S1].
• Funding agency: Department of Environment, GNCTD [S1].
• MoES is NOT the implementing ministry of the Delhi pilot [S1].
• CAIPEEX = Cloud Aerosol Interaction and Precipitation Enhancement Experiment, by IITM Pune under MoES [S2].
• CAIPEEX showed rainfall enhancement of up to 46 ± 13% at seeded locations [S2].
• Average enhancement: 18 ± 2.6% over 100 sq km downwind area [S2].
• CAIPEEX added ~867 million litres of water [S2].
• High Altitude Cloud Physics Laboratory is at Mahabaleshwar [S2].
• Cloud seeding agents: silver iodide, sodium chloride, calcium chloride (hygroscopic/glaciogenic).
• Pilot purpose: emergency air-pollution mitigation during episodic events [S1].
• First installment to IIT Kanpur: Rs 37,93,420 [S1].

8. Mains Relevance

• GS-III: Environmental pollution; Science & Technology — indigenisation & developments.
• GS-II: Centre-State relations; functions of Union ministries vis-à-vis NCT of Delhi.
• Plausible question stems: 1. "Cloud seeding offers a tactical, not strategic, response to Delhi's air pollution." Critically examine. 2. Discuss the scientific basis, limitations, and governance challenges of weather modification in India, with reference to CAIPEEX and the Delhi pilot. 3. Evaluate the federal-administrative complexities arising in the Delhi cloud-seeding pilot.

9. Related Topics to Study Next

• GRAP (Graded Response Action Plan) — primary Delhi-NCR pollution tool, run by CAQM.
• CAQM Act, 2021 — statutory basis for NCR air quality governance.
• NCAP (National Clean Air Programme), 2019 — MoEFCC's airshed strategy.
• CAIPEEX & IITM Pune — national R&D backbone for cloud physics.
• DGCA & airspace regulation — clearances for seeding sorties.
• Article 239AA — special status of NCT of Delhi; explains GNCTD's lead role.
• Stubble burning & PM2.5 sources — upstream cause Delhi is trying to mask.
• Geoengineering / SRM debate at UNEP — global context for weather modification ethics.

10. Common Errors / Trap Areas

• Wrongly attributing the Delhi pilot to MoES / IITM Pune / IIT Delhi — it is GNCTD + IIT Kanpur; MoES has explicitly distanced itself [S1].
• Confusing CAIPEEX (rain-shadow rainfall enhancement) with the Delhi pollution-mitigation pilot — different objectives [S1][S2].
• Assuming cloud seeding "creates" clouds — it only modifies pre-existing conducive clouds [S1].
• Treating it as a permanent solution; the PIB explicitly calls it an emergency / episodic tool [S1].
• Mixing up Mahabaleshwar HACPL (research lab) with operational seeding sites.

11. Sources

• [S1] PARLIAMENT QUESTION: ASSESSMENT OF CLOUD SEEDING IN DELHI, PIB, Ministry of Earth Sciences, 05 Feb 2026 — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2223590 — (tier: 1)
• [S2] PARLIAMENT QUESTION: CLOUD SEEDING (CAIPEEX results, IITM), PIB, Ministry of Earth Sciences — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2147269 — (tier: 1)