Abstract Due to direct exposure to high temperatures in summer, sanitation workers can easily experience heat-related illness and even mortality. This paper aims to determine the thresholds of the environmental parameters for sanitation workers in summer. Firstly, a field test of sanitation workers was conducted, the environmental parameters (solar radiation intensity, dry bulb temperature, wind speed and relative humidity) and mean skin temperature were measured, and the thermal comfort and work willingness were investigated via a questionnaire. Then, the mathematical programming method was adopted to obtain the safety limits and danger limits of the environmental parameters. Finally, the thresholds of the outdoor heat stress indexes, namely, the environmental stress index (ESI), discomfort index (DI), heat index (HI) and relative strain index (RSI) were obtained. The results indicate that a high solar radiation intensity, high dry bulb temperature, high wind speed and low humidity will cause more adverse effects on sanitation workers in summer. The safety limits of the solar radiation intensity, dry bulb temperature, wind speed and relative humidity are 182.42 W/m2, 28.42 °C, 0.15 m/s and 71.35%, respectively, and the danger limit value are 876.86 W/m2, 34.98 °C, 1.26 m/s and 36.59%, respectively. In addition, the safety limit values of the ESI, DI, HI and RSI are 27.08 °C, 26.22 °C, 31.70 °C and 0.13, respectively; and the danger limit values are 29.60 °C, 27.84 °C, 36.21 °C and 0.25, respectively. This paper can provide a study method and reference data for the work arrangement and health protection of sanitation workers in summer.

中文翻译：

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基于数学规划确定夏季环卫工人健康保护环境参数阈值

摘要 由于夏季直接暴露在高温下，环卫工人很容易患上热病甚至死亡。本文旨在确定夏季环卫工人环境参数的阈值。首先对环卫工人进行现场测试，测量环境参数（太阳辐射强度、干球温度、风速和相对湿度）和平均皮肤温度，通过问卷调查热舒适度和工作意愿。然后，采用数学规划方法获得环境参数的安全限值和危险限值。最后，室外热应激指标的阈值，即环境应激指数（ESI）、不适指数（DI）、热指数（HI）和相对应变指数（RSI）。结果表明，夏季太阳辐射强度高、干球温度高、风速大、湿度低对环卫工人的不利影响更大。太阳辐射强度、干球温度、风速和相对湿度的安全限值分别为182.42 W/m2、28.42℃、0.15 m/s和71.35%，危险限值为876.86 W/m2、34.98 °C，分别为 1.26 m/s 和 36.59%。此外，ESI、DI、HI和RSI的安全限值分别为27.08℃、26.22℃、31.70℃和0.13；危险限值分别为29.60℃、27.84℃、36.21℃和0.25。本文可为环卫工人夏季的工作安排和健康保护提供研究方法和参考资料。