Delhi's Disaster Profile: Earthquakes, Floods, Heat, Storms, Toxic Air

Delhi (NCT) faces a rare convergence of natural and anthropogenic hazards:

Compound Risk

Heat + pollution = cardiovascular crisis. Flood + contamination = cholera/typhoid. Earthquake + dense unreinforced masonry = mass casualties.

Governance Response

  • Delhi Disaster Management Authority (DDMA)
  • Graded Response Action Plan (GRAP) for air
  • Heat Action Plan (2023)
  • Yamuna floodplain encroachment — persistent enforcement failure

Delhi's 33M people inhabit a hazard amplifier: geological, meteorological, and self-inflicted risks intersecting.

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HazardMechanismSeasonSeverity
EarthquakesSeismic Zone IV (MSK VIII); Himalayan thrust proximityYear-roundModerate–high (M6+ possible)
FloodsYamuna + tributaries (Sahibi, Najafgarh drain); urban drainage failureMonsoon (Jul–Sep)Recurrent; 2023 severe
HeatwavesContinental 40–48°C; UHI + humidity = lethal wet-bulbPre-monsoon (Apr–Jun)Increasing frequency/duration
StormsDust storms (Andhi), thunderstorms, squall linesPre-monsoon (Mar–May)Property damage, transport disruption
Air PollutionPM2.5 150–500+ µg/m³; stubble burning + inversion + traffic + industryPost-monsoon (Oct–Jan)Chronic; #1 globally (IQAir)