Intervention record · CHANGE4PLANET

The intervention

TIMELINE

WHAT WAS DEPLOYED

In May 2010 a heat wave with maximum temperatures of 46.8 C was associated with 4,462 all-cause deaths in Ahmedabad, an excess of 1,344 deaths, 43.1% above the reference period [3]. In response the Ahmedabad Municipal Corporation, with IIPH Gandhinagar, NRDC, IMD and academic partners, developed South Asia's first city heat action plan, piloted in 2013 and fully implemented in 2014 [1][2]. The plan has three elements: a probabilistic 7-day early warning system with color-coded alerts issued against locally derived maximum-temperature thresholds, interagency coordination led by an appointed nodal officer in the city health department, and pre-season community outreach plus training of medical and community health staff [1][2][4]. A 2018 peer-reviewed evaluation compared summer all-cause mortality in 2014-2015 against a 2007-2010 baseline and estimated 2,380 avoided deaths across the two post-implementation years, an annualized 1,190 (95% CI 162-2,218); the mortality rate ratio at 47 C fell from 2.34 pre-plan to 1.25 post-plan [1]. That estimate covers only the warning, outreach and health-system components: the cool roofs component began in 2017, after the evaluation window, and its measured evidence is limited to indoor temperatures. In 2017 and 2018 the AMC applied white lime wash to the roofs of 3,000 low-income homes, 500 per city zone, about 2% of the city's low-income housing stock, at a reported 2017 program cost of Rs 700,000 (US$10,450) [4][6][7]. An implementer-conducted instrumented study in three slums measured indoor air around 1 C cooler under solar reflective white paint on tin roofs and about 2.5 C cooler under thermocol false ceilings beneath asbestos, against same-day non-intervention roofs [5]. The plan has operated every heat season since 2013, and by late 2022 India's National Disaster Management Authority was working with 23 of 28 states to develop heat action plans on its model [8][9].

HOW IT WORKS

Administrative: the IMD Meteorological Centre in Ahmedabad supplies maximum-temperature forecasts; the AMC issues color-coded citywide alerts against thresholds set by the AMC (2019 edition: yellow Hot Day Advisory 41.1-43 C, orange Heat Alert Day 43.1-44.9 C, red Extreme Heat Alert Day 45 C and above) [4]. A nodal officer in the health department activates a communication cascade to agency leaders, deputy municipal commissioners, hospitals, urban health centres, the 108 ambulance service, link workers and media, and can open cooling centers such as temples, malls and night shelters, extend water distribution, and trigger a utility protocol keeping power to hospitals [4]. The annual cycle is fixed: January-March training, materials and high-risk-area mapping; March-July alert operations; July-September evaluation and plan revision, with the revised plan posted publicly [4]. Outreach runs through pamphlets, billboards, radio, text messages, WhatsApp and school programs in local languages [2][4]. Physical: the cool roofs component raises roof solar reflectance in low-rise, low-income housing, mainly with three coats of white lime wash applied by AMC-hired contractors and volunteers, plus donated SRI-122 reflective coating on a subset of pilot homes; reflective roofs absorb less solar radiation and lower indoor air temperature by measured amounts of roughly 1 to 2.5 C depending on roof type and technology [5][6][7].

The measurements

11 OUTCOMES

OUTCOMES

METRIC	VALUE	METHOD	MEASURED BY	INDEPENDENT	PERIOD	SRC
Estimated all-cause deaths avoided in the post-plan period (2014-2015 combined)	2380 deaths (95% CI 324-4,435)	Ecological pre-post evaluation: expected deaths modelled by applying the 2007-2010 baseline temperature-mortality response to observed post-plan summer temperatures, compared with registered deaths; daily April-June all-cause mortality assembled by the AMC from hospitals, crematoria and burial grounds; daily maximum temperature from the airport meteorological station	University of Washington and Emory-led team with IIPH-G, NRDC, Mount Sinai, IMD and AMC co-authors; peer-reviewed	●	2014-2015	[1]
Estimated average annualized deaths avoided post-plan	1190 deaths per year (95% CI 162-2,218)	Same evaluation, expressed as annualized average	Same team	●	2014-2015	[1]
Rate ratio of all-cause mortality at 47 C (lag 0)	1.25 rate ratio (95% CI 1.02-1.53) · baseline 2.34 (95% CI 1.98-2.76) pre-plan (2007-2010)	Distributed temperature-mortality response modelling before and after implementation	Same team	●	2014-2015	[1]
Post-to-pre-plan incidence rate ratio of nonlagged summer mortality on days above 40 C	0.95 IRR (95% CI 0.73-1.22); 0.73 (95% CI 0.29-1.81) for days above 45 C	Incidence rate ratio comparison across periods	Same team	●	2014-2015	[1]
Pre-intervention baseline event: excess all-cause deaths, May 2010 heat wave	1344 excess deaths (4,462 observed vs 3,118 reference; a 43.1% increase) · baseline 3,118 deaths (reference period) (May 2009 and May 2011)	Comparison of May 2010 registry deaths against the mean of corresponding days in May 2009 and May 2011; average daily mortality 143.9 vs 100.6	IIPH Gandhinagar and Emory researchers using AMC Registrar of Births and Deaths data; peer-reviewed	●	2010	[3]
Low-income homes converted to cool roofs in the 2017-2018 limewash pilots	3000 homes (500 per city zone; about 2% of the city's low-income households)	Operator-reported program count; the city's Slum Free City Plan lists 162,749 houses in 691 notified slum settlements as the denominator context	Ahmedabad Municipal Corporation	○	2017-2018	[4]
Mean indoor air temperature under solar reflective white paint on tin roof	33.5 C (vs 34.59 C same-day uncoated tin roof; consistently around 1 C lower) · baseline 34.59 C uncoated tin, same day (same-day control)	Lascar EL-USB-2 data loggers recording per minute, 10:00-17:00, one day per technology (2017-10-06), one household per roof type, with FLIR thermography; one-way ANOVA and Tukey HSD, p<0.05	MHT and IIPH-G research team (MHT installed the roofs; NRDC funded)	○	October 2017	[5]
Mean indoor air temperature under ModRoof (coconut husk and paper waste modular roof)	33.82 C (vs 35.80 C tin and 36.83 C asbestos same-day; about 4.5 C below control roofs at midday) · baseline 35.80 C tin; 36.83 C asbestos; 33.75 C concrete (same-day controls)	Same instrumented study, day 1 (2017-10-04)	MHT and IIPH-G research team	○	October 2017	[5]
Mean indoor air temperature under thermocol false ceiling beneath asbestos roof	33.5 C (vs 35.88 C asbestos same-day; about 2.5 C lower) · baseline 35.88 C asbestos; 35.44 C tin; 33.25 C concrete (same-day controls)	Same instrumented study, day 4 (2017-10-10)	MHT and IIPH-G research team	○	October 2017	[5]
Mean indoor air temperature under Air-lite ventilation sheet on tin roof (tested and found ineffective for cooling)	37.77 C (vs 35.14 C tin and 35.29 C asbestos; the intervention ran hotter than all control roofs) · baseline 35.14 C tin; 35.29 C asbestos; 33.06 C concrete (same-day controls)	Same instrumented study, day 2 (2017-10-05)	MHT and IIPH-G research team	○	October 2017	[5]
Surveyed slum households aware of the Heat Action Plan	25 % of 16 surveyed households (about 60% had never seen the plan's awareness materials)	Short structured survey of the 16 study households alongside the roof measurements	MHT and IIPH-G research team	○	October 2017	[5]

● independently measured○ operator-reported· not stated in any source

COST BASIS

CAPITAL: not published
OPERATING: not published
PER UNIT: 1.5 INR per square foot, locally available white lime paint, as reported 2019 [7]
FUNDING: 2
2
2
1
6

The 2017 cool-roofs pilot component, covering 3,000 homes, was budgeted at a total reported program cost of about Rs 700,000 (US$10,450); this is a component figure only, not an intervention-wide capital cost [7]. The same 2019 factsheet quotes the lime paint at Rs 1.50 (~$0.02) per square foot in the Ahmedabad program section and lime wash at Rs 0.50 (~$0.07) per square foot in its funding sidebar; both the rupee figures and the dollar conversions are mutually inconsistent and the discrepancy is unresolved in the source [7]. The SRI-122 reflective paint used on 10-15 pilot households in 2017 was donated by the manufacturer [6]. Hyderabad comparison in the same factsheet: HDPE cool-roof membrane retailing at Rs 13 per square foot [7].

The assessment

PRECONDITIONS

A quantified local heat-mortality baseline from a functioning civil death registry; the plan was built on documented excess mortality from May 2010 measured from AMC registry data [1][3]
A meteorological service able to provide multi-day maximum-temperature forecasts; Ahmedabad used probabilistic 7-day forecasts from the IMD centre with a system built by Georgia Tech [1][2]
A municipal health department with authority to coordinate other agencies, an appointed nodal officer, and named heat points-of-contact in each department [2][4]
Existing last-mile infrastructure to carry outreach and response: urban health centres, link workers, the 108 ambulance service, schools and night shelters [2][4]
A trusted local research partner and municipal leadership interest; the AMC's disaster-preparedness experience after the 2001 earthquake was an enabling factor [2]
Locally calibrated alert thresholds, revised across plan editions, rather than thresholds imported from elsewhere [1][4]
An annual cycle treated as routine municipal business: pre-season training and materials from January, alert operations March-July, post-season evaluation and public revision of the plan [4]
For the cool roofs component: low-rise tin, asbestos or concrete roofs, locally available lime wash or reflective coatings, delivery partners with community trust, and re-application as part of roof maintenance [4][5][6][7]

OPERATOR HINDSIGHT

Stated in the sources themselves. The evaluators [1]: interpret the avoided-death estimate with caution; the analysis is limited by only two post-implementation years with few very hot days, and could not control for air pollution or demographic change; longer monitoring is needed as the plan evolves. The plan developers [2]: interagency communication was initially limited and hospitals and the public were not alerted to impending heat waves; the plan answered this with formalized communication channels, and heat had to be reframed as a disaster deserving high-level preparation. The 2019 plan edition [4] tasks hospitals with expedited cause-of-death recording and a heat mortality tracking system, both prerequisites for better evaluation, and moves cool roofs from annual pilots toward a citywide program with mandatory coverage of municipal, government and commercial buildings, voluntary residential uptake, and low-income delivery through the plan and CSR channels. The cool-roof field study [5]: about two thirds of surveyed slum households did not know the plan existed and about 60% had never seen its awareness materials, so outreach was not reaching the most exposed; it recommends larger cool-roof studies with improved designs, and found that one promoted product, the Air-lite ventilation sheet, raised indoor temperatures and should not be deployed for cooling.

TRANSFERABILITY ASSESSMENT

AXIS	SCORE	RATIONALE
CAPITAL INTENSITY	●●	Development deliberately leaned on staff and infrastructure the municipality already had rather than new spending [2], and the 3,000-roof cool-roofs pilot cost Rs 700,000, about US$10,450 [7]: routine municipal budget scale.
GOVERNANCE DEPENDENCY	●●	Implemented by the AMC under existing municipal health powers through an appointed nodal officer and formalized interagency communication channels; no new legislation was required [2][4].
ENVIRONMENTAL SPECIFICITY	●●	Forecast-based warning plus preparedness applies wherever a heat-mortality burden and a forecast service exist; the model spread to over 17 Indian cities and 6 states by 2017 [6] and NDMA was working with 23 of 28 states by 2022 [8], though alert thresholds must be recalibrated locally [1][4].
SKILLS AND MAINTENANCE	●○	Operations run on existing municipal and health staff, but require an appointed nodal officer, annual pre-season training of medical and community workers [4], and the initial build needed external forecasting and epidemiology partners (Georgia Tech, IIPH-G, NRDC) [2].
FUNDING REPEATABILITY	●○	Development and evaluation were philanthropically and externally funded (CDKN, NRDC, NIH) [1][2]; the cool roofs component leaned on donated paint, volunteers and CSR with a dedicated budget only under discussion in 2017 [6]; core operations sit in existing budget lines but no recurrent HAP budget has been published [2][4].
POLITICAL DURABILITY	●●	Operated and periodically updated every heat season from the 2013 pilot through documented editions to 2019 [4] and plan-linked programs reported operating in June 2025 [9], across twelve years of municipal leadership rotation; the model was institutionalized nationally through NDMA [8].

TOTAL 10/12 · T1

POLITICAL TEST

The plan has run every heat season since the 2013 pilot: full implementation 2014 [1], annually updated editions documented through the 2019 update [4], the cool roofs component added in 2017 under the sitting mayor, who inaugurated it by painting the first roof [6], and plan-linked heat programs (cool roofs in the plan, a misting bus stop, parametric heat insurance for informal workers) reported operating in June 2025 [9]. Over that period the model was adopted upward rather than defended locally: by 2017 heat action plans and early warning systems covered over 17 Indian cities and 6 states [6], and by November 2022 the National Disaster Management Authority was working with 23 of India's 28 states to develop and implement heat action plans [8]. Caveat: the sources document twelve years of continuity across rotations of mayor and municipal commissioner, but none of them records a change of ruling party at city level within the window, so survival of a partisan transition at the AMC specifically is not directly evidenced.

The file

9 SOURCES

SOURCES

[1] peer_reviewed · Building Resilience to Climate Change: Pilot Evaluation of the Impact of India's First Heat Action Plan on All-Cause Mortality · Jeremy J. Hess and colleagues (University of Washington, IIPH Gandhinagar, Emory University, NRDC, Icahn School of Medicine at Mount Sinai, IMD, Ahmedabad Municipal Corporation) · Journal of Environmental and Public Health, vol. 2018, article 7973519 (doi:10.1155/2018/7973519) · 2018 · en · PRIMARY · INDEPENDENT · pmc.ncbi.nlm.nih.gov Full text fetched and read at PubMed Central. All mortality estimates, rate ratios, confidence intervals, study periods, population figures, funding grants and stated limitations were read from this text. Independence is qualified: the author team includes AMC staff and plan co-developers, and mortality data are assembled by the AMC; the analysis itself was university-led and externally funded.
[2] peer_reviewed · Development and Implementation of South Asia's First Heat-Health Action Plan in Ahmedabad (Gujarat, India) · Kim Knowlton, Suhas P. Kulkarni, Gulrez Shah Azhar, Dileep Mavalankar, Anjali Jaiswal, Meredith Connolly, Amruta Nori-Sarma, Ajit Rajiva, Priya Dutta, Bhaskar Deol, Lauren Sanchez, Radhika Khosla, Peter J. Webster, Violeta E. Toma, Perry Sheffield, Jeremy J. Hess · International Journal of Environmental Research and Public Health, 11(4):3473-3492 (doi:10.3390/ijerph110403473) · 2014-03-25 · en · PRIMARY · pmc.ncbi.nlm.nih.gov Full text fetched and read at PubMed Central. Authored by the plan's own developers, so treated as a primary but not independent account of development, components, timeline, enabling factors, barriers and funding.
[3] peer_reviewed · Heat-Related Mortality in India: Excess All-Cause Mortality Associated with the 2010 Ahmedabad Heat Wave · Gulrez Shah Azhar, Dileep Mavalankar, Amruta Nori-Sarma, Ajit Rajiva, Priya Dutta, Anjali Jaiswal, Perry Sheffield, Kim Knowlton, Jeremy J. Hess · PLoS ONE 9(3):e91831 (doi:10.1371/journal.pone.0091831) · 2014-03-14 · en · PRIMARY · INDEPENDENT · pmc.ncbi.nlm.nih.gov Full text fetched and read at PubMed Central. Source of the 2010 baseline event figures: 4,462 deaths in May 2010, excess 1,344 (43.1%) against the mean of May 2009 and May 2011, daily means 143.9 vs 100.6, Tmax 46.8 C. Measures the pre-intervention baseline, before the plan existed; several authors later co-developed the plan.
[4] program_document · Ahmedabad Heat Action Plan: Guide to Extreme Heat Planning in Ahmedabad, India (Easy Read Version, 2019 Update) · Ahmedabad Municipal Corporation and partners · Ahmedabad Municipal Corporation (hosted by NRDC) · 2019 · en · PRIMARY · www.nrdc.org Full 26-page PDF fetched and text-extracted (the hosting URL is named 2018 but the document is the 2019 update). Source of the alert thresholds, nodal officer arrangement, phase-by-phase actions, agency checklists, the 2017-2018 cool roof pilot scale (3,000 homes, 500 per zone, about 2% of low-income households) and the Slum Free City Plan denominator (691 notified slums, 162,749 houses, population 727,934). Contains no budget figures.
[5] technical_report · Combating climate-change induced Heat stress: Assessing cool roofs and its impact on the indoor ambient temperature of the households across slums of Ahmedabad · Mahila Housing Sewa Trust and IIPH Gandhinagar research team (Bijal Brahmbhatt, Sathish LM, V. Selvakumar, Srishti Singh, Priya Dutta) · Gujarat Mahila Housing Sewa Trust, with IIPH Gandhinagar; supported by NRDC · accessed 2026-08-13 · en · PRIMARY · www.mahilahousingtrust.org Full 20-page report fetched and read. The report is undated; fieldwork dates in its study table are 4-10 October 2017 (its text says September 2017, a discrepancy). A peer-reviewed version (Vellingiri et al., Indian Journal of Occupational and Environmental Medicine 2020;24(1):25-29) is paywalled and could not be fetched (HTTP 402); all figures here were read from the full report. MHT installed the roofs and co-authored, so the measurements are implementer-conducted.
[6] issue_brief · Cool Roofs: Protecting Local Communities from Extreme Heat (Interim Issue Brief) · NRDC (Anjali Jaiswal, Laasya Bhagavatula, Sameer Kwatra, Karan Chouksey, Nehmat Kaur), ASCI (Srinivas Chary Vedala, Rajkiran V. Bilolikar, Sree Sowmya Chinta), IIPH-G (Dileep Mavalankar, Abhiyant Tiwari, P. S. Ganguly) · Natural Resources Defense Council, Administrative Staff College of India, Indian Institute of Public Health Gandhinagar · 2017-06 · en · PRIMARY · iiphg.edu.in Full 24-page PDF fetched and read (mirror hosted by IIPH-G; filename says 2018, cover says Interim Issue Brief, June 2017). Source for the 2017 cool roofs launch: 3,000-home target across 6 zones, mayoral inauguration May 2017, donated SRI-122 paint on 10-15 pilot homes, three lime layers via AMC contractors, 50 student volunteers, MHT's earlier 250-plus ModRoof installations and MHT's own 7-8 C claim, and the 2016-2017 spread of heat action plans to over 17 cities and 6 states.
[7] factsheet · Keeping It Cool: How Cool Roofs Programs Protect People, Save Energy and Fight Climate Change · NRDC International: India · Natural Resources Defense Council · 2019-07 · en · PRIMARY · www.nrdc.org Full 6-page PDF fetched and read. Source of the cool-roof cost figures: white lime paint Rs 1.50 (~$0.02) per square foot and total 2017 program cost Rs 700,000 ($10,450); its funding sidebar separately quotes lime wash at Rs 0.50 (~$0.07) per square foot, an internal inconsistency noted in this record. Also states MHT had installed over 100 ModRoofs, versus over 250 in the June 2017 brief.
[8] case_study · Ahmedabad, India's Heat Action Plan, the first in South Asia, saving lives · Exemplars in Global Health editorial team · Exemplars in Global Health · 2022-11-10 · en · INDEPENDENT · www.exemplars.health Fetched and read. Source for national replication status: NDMA working with 23 of India's 28 states on heat action plans as of November 2022, and for the attribution of the roughly 1,190 averted deaths per year figure to the Hess research. Quotes plan developers; no cost figures.
[9] news · Beyond the thermometer: Ahmedabad uses cool roofs, misting bus stops and heat insurance for climate resilience · Down To Earth staff · Down To Earth · 2025-06-16 · en · INDEPENDENT · www.downtoearth.org.in Fetched and read. Documents plan-linked activity as of June 2025: cool roofs included in the city's Heat Action Plan, a misting Cool Bus Stop at Lal Darwaza reported to cut temperatures 4-7 C, and MHT-facilitated parametric heat insurance (Rs 354 annual premium, payouts of Rs 750 at 43.7 C and Rs 1,250 at 44.1 C, capped at Rs 2,000 per year). Used to establish continued operation, not for outcome figures.

RECORD

PUBLISHED: 2026-08-13
LAST VERIFIED: 2026-08-13
REVIEW DUE: 2027-02-13
RUBRIC: v1.0
STATUS HISTORY: 2026-08-13 · operating · Record published.
LANGUAGE: All sources cited are English-language publications. The plan's own outreach materials are produced in Gujarati and other local languages [2][4]; Gujarati-language materials were not separately reviewed.
CONFIDENCE: Solid: the 2010 baseline figures (1,344 excess deaths, 43.1%, 46.8 C), the evaluation's avoided-death estimates (2,380 total, 1,190 annualized, with CIs), the rate ratio shift at 47 C (2.34 to 1.25), study periods, alert thresholds, the cool roof pilot scale (3,000 homes, 500 per zone) and pilot cost (Rs 700,000, US$10,450), and the instrumented indoor temperature comparisons were all read directly from the cited documents, not from abstracts or secondary summaries. Attribution limits: (a) the avoided-death estimate covers 2014-2015 and so measures only the warning, outreach and health-system components; the cool roofs program began in 2017 and no mortality effect has been measured for it; within the evaluated components the design cannot separate the contribution of warnings, outreach or clinical training. (b) The evaluators name uncontrolled confounders (air pollution, heat wave timing within season, demographic change, adaptation unrelated to the plan) and only two post-implementation years with few very hot days; causality is plausible, not proven. Thin or discrepant: (c) the cool-roof temperature study covers 16 households, one day per technology, conducted by the implementer, and one summary paragraph in the report contradicts its own figure by attaching the Air-lite mean (37.78 C) to the white paint intervention; this record uses the per-day results and the report's Figure 8 values; the report's text also says September 2017 while its study table says October 2017. (d) The paint cost appears as Rs 1.50 and Rs 0.50 per square foot within the same factsheet, with mutually inconsistent dollar conversions; unresolved, both reported. (e) MHT's prior ModRoof count differs across sources (over 250 in [6], over 100 in [7]) and MHT's 7-8 C ModRoof claim is an operator claim, not a measurement. (f) Alert thresholds differ slightly between the evaluation's description (yellow 41-42.9 C) and the 2019 plan edition (yellow 41.1-43 C), reflecting revisions across editions. (g) City population differs across sources: 5,577,940 (2011 census) and 6,705,669 (2015 estimate) in [1] versus 7.2 million in [2]; the record uses [1]. (h) The 2010 excess mortality is 43.1% in [3] versus at least 30% in [2]; the record uses [3]. (i) No budget for the plan as a whole has been published; capital and operating figures beyond the cool-roofs pilot are null. (j) Continued operation is documented through June 2025 reporting [9] and the 2019 plan edition [4]; no 2026 plan edition was fetched. No figures were estimated or interpolated by the registry; all nulls reflect absence in sources.

CITE THIS RECORD

change4planet.org. C4P-URB-0002: City heat action plan with early warning, health-system preparation and cool roofs (Ahmedabad, India): estimated 1,190 avoided deaths per year in the first evaluated seasons. Grades T1/E2 (rubric v1.0). Last verified 2026-08-13. https://change4planet.org/records/c4p-urb-0002-ahmedabad-heat-action-plan