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A heat wave is a period of excessive heat lasting two or more days
High humidity can make the effects of heat even more harmful
Heat-related illness and death can occur due to exposure to intense heat in just one afternoon
Heat stress on the body has a cumulative effect, and consequently, the longer a heat wave lasts, the greater the threat to health
Most heat-related deaths occur in cities
Buildings, asphalt and concrete streets and sidewalks, and tar roofs absorb daytime heat and slowly release it at night, and so temperatures in urban areas can be warmer than rural areas by several degrees both day and night. This is commonly called the urban “heat-island” effect.
In addition to heat, stagnant air often develops during heat waves, with pollutants increasing in concentration near the ground and contributing further to health problems
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