In 2019, Los Angeles County coated streets across a 0.64-square-kilometer neighborhood; surfaces were up to 9°F cooler, but ten months later the cooling effect had fallen by about 1.8°F

In an effort to combat the urban heat island phenomenon, Los Angeles initiated cool pavement trials in the Winnetka and Pacoima neighborhoods. The projects featured reflective coatings, which initially reduced surface temperatures. However, as time went on, weathering impacted their effectiveness. Findings from these studies pointed to the necessity for ongoing maintenance to uphold reflectivity, while indicating a need for deeper exploration regarding pedestrian comfort and long-term advantages.
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