Herein,extreme heat was analyzed,and risk days of extreme heat and population exposure were evaluated using a heat index based on data from five observation stations in Fuyang,Anhui Province,China,during the summer of 1970-2022.The results show that extremely hot days exhibited an increasing trend of 1.33 d/10 a and the heat index also showed a growing trend.The increasing trends demonstrated by the heat index on weekends were obviously lower than those on weekdays,with the highest value observed at 1400 LST.Further analysis reveals that low-risk days of extreme heat in Fuyang during the summer of 1970-2022 showed a decreasing trend of 0.85 d/10 a.Meanwhile,the number of middle-risk days of extreme heat increased by 1.42 d/10 a.This shift indicates that extreme heat in summer over Fuyang changed from low risk to middle risk.Compared with the 1978-2000 base period,population exposure to extreme heat more than doubled during 2005-2022.It is showed that the climate factor contributed 75.06%to changes in population exposure,followed by the population factor(17.32%)and the interaction effect of population and climate(7.62%).
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