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Nationwide analysis, including census block group assessments of temperature amplification in 65 cities, identifies areas where residents face highest risks during extreme heat eventsPRINCETON, N.J., July 10, 2024 /PRNewswire/ -- More than 5 million people in New York City, Chicago, and San Francisco live in environments capable of amplifying summer temperatures by at least 10 degrees Fahrenheit, according to a Climate Central analysis of 65 U.S. cities. Called urban heat islands, these areas will increasingly expose residents to higher heat-related health risks as climate change raises local temperatures.Millions exposed to higher temperatures in 65 major U.S. cities, urban heat island research shows Post this More than 1 million Chicago residents live in areas where the built environment can increase temperatures by at least 9 degrees Fahrenheit.For 145,000 living in the most extreme urban heat islands, the local built environment can push temperatures even higher, by 12 degrees Fahrenheit or more. Climate Central's analysis of census block groups – typically fractions of neighborhoods including a handful of city blocks – identified areas within 19 cities where factors such as building and paving materials, population density, and lack of greenspace can make temperatures far hotter than in neighboring communities.Few city residents can avoid the influence of urban heat islands. Nearly 34 million – 68% of the population within the cities analyzed by Climate Central – live in environments capable of boosting temperatures by at least 8 degrees Fahrenheit