Recent studies have highlighted that the heat index is rising faster than air temperature in many regions.
In scientific and meteorological contexts, "hot" indices measure heat's impact on humans or the environment:
"Optimizing Road Longevity: The flexibility index of hot in-place recycling (HIR) asphalt mixtures is a key indicator of cracking resistance. By analyzing the dynamic stability and binder content, engineers can ensure that recycled pavement materials maintain high performance and durability under heavy traffic loads." 5. Web Search / Real-Time Trends
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