Huhehaote had a negative trend with very small value of −0.009 °C/a, and the negative trend in UTCI was negligible in Chengdu with an even smaller value of −0.001 °C/a.
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Optimal Strategy on Radiation Estimation for Calculating Universal Thermal Climate Index in Tourism Cities of China.
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The sentences
In contrast to the decrease in days under no thermal stress, the days under strong heat stress showed an increasing trend in most tourism cities in summer ( Figure 8 b), which would inevitably cause more potential heat threats to the public health and make the further investigation on thermal perception essential and urgent [ 28 ]. 4.3.