Karachi's Silent Heat Crisis: Experts Urge Action

Karachi is experiencing a silent heat crisis, with experts calling for urgent action to mitigate its growing impact on public health and productivity. A senior community health sciences expert highlighted that the city's urban heat effect is intensifying due to rapid growth, increased pollution, and a loss of green spaces. Studies from Karachi indicate significant urban heat island effects, with one 2026 study revealing a 4.5°C higher urban-rural temperature difference among major Pakistani cities. Recent microscale studies found delivery riders and rickshaw drivers experienced temperatures substantially higher than official averages, underscoring the real heat exposure on the streets.

The expert pointed to visible warning signs such as inadequate night-time cooling and increased instances of dehydration, fatigue, and heat-related illnesses, particularly affecting vulnerable populations like the elderly, children, pregnant women, and outdoor workers. The combination of heat and air pollution poses a severe health risk, as heat exacerbates the effects of pollutants. Higher temperatures also create favorable conditions for certain pathogens and increase risks of water-borne and food-borne infections, especially in areas with weak sanitation and drainage systems.

Addressing this crisis requires a two-pronged approach: individual precautions like avoiding peak heat exposure and staying hydrated, and robust government action. The latter should include a heat-health action plan with public alerts, shaded public spaces, and legal protections for outdoor workers. Crucially, the city must reduce heat at its source by protecting trees, expanding green areas, improving public transport, and mandating heat assessments for infrastructure projects, fostering collaboration among various authorities for a climate-resilient future.