The city is forecast to double the number of days it reaches 95F by 2050, but innovative materials may help fight off the heat
predicts that by 2050 the number of days with temperatures of 95F or hotter will reach 22 a year – more than double the number that the Los Angeles region sees now.half the surfaces are dark asphalt or concreteLos Angeles has the worst “urban heat island effect” – a phenomenon in which cities trap and retain heat due to their high concentration of buildings, roads and other developments – of any city in California.
A ‘cool street’ in Los Angeles swaps traditional black asphalt surfacing for a coating designed to reflect heat.Nearly a decade ago, the LA mayor’s office. Led by researcher George Ban-Weiss from the University of Southern California , the panel created a computer model of the city’s neighborhoods and microclimates, which allowed it to recommend where cool roofs and pavements and shady trees could be added most effectively.
The city has converted 5.3m sq ft of pavement in 2022 alone – about 92 lane-miles – in the hottest areas of the city. There’s also a focus on newly paved streets, Shaw says, with the expectation that the reflective coating will last as long as traditional asphalt: 20-30 years. A monthly temperature reading from the city’s general services division collects data on how much cooler the treated streets are than nearby untreated streets.
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