In June 2026, large parts of India baked under temperatures exceeding 45°C, with some regions reporting wet-bulb temperatures approaching the survivability threshold for healthy humans. The heatwave is not an isolated weather event — it is the latest data point in a trend that makes India one of the most heat-exposed countries on Earth.

Why heat is unequally distributed

Temperature alone does not capture who suffers. The real story is in three layers of inequality:

  1. Occupational exposure. An estimated 90% of India's workforce is in the informal sector, much of it outdoors: construction, agriculture, street vending, rickshaw driving. These workers cannot retreat into air-conditioned offices. Heatstroke, kidney damage from chronic dehydration, and lost wages during peak heat hours are occupational hazards with no safety net.
  2. Cooling access. Air conditioning ownership in India remains below 10% of households. Even where electricity is available, grid reliability during heatwaves is precarious as demand spikes trigger brownouts. The result: the wealthiest neighborhoods hum with AC compressors while poorer districts rely on wet cloths and hand fans.
  3. Urban heat-island effect. Dense informal settlements with corrugated-metal roofs, narrow lanes, and minimal green cover can be 4-7°C hotter than nearby affluent areas with tree-lined streets and open spaces. The built environment amplifies inequality.

The wet-bulb threshold

A wet-bulb temperature of 35°C is considered the upper limit of human survivability without artificial cooling — the point at which the body can no longer shed heat through sweating. Parts of South Asia have already approached this threshold in recent years. With every additional 0.5°C of global warming, the frequency of such events increases non-linearly.

The knowledge takeaway

Heatwaves are often reported as natural disasters, but their human toll is almost entirely shaped by policy choices: urban planning, labor protections, energy-grid investment, and public-health early-warning systems. India's heat crisis is a preview of challenges that will spread across the global south as warming continues.