Improving Outdoor Thermal Comfort for Agricultural Workers: A Study of Heat Stress Relief Measures Using Sun Protection Lotions

The entire study was carried out on a group of 100 female farm workers at the CTAE university campus in Udaipur during the wheat crop harvesting season, with the aim of examining the effectiveness of various heat stress relief measures (sun protection lotion with different sun protection factors, SPF) in improving outdoor thermal comfort. The experiments were designed to assess the average skin temperature of Indian female farm workers under five fixed Wet Bulb Globe Temperature (WBGT) conditions (28, 29, 30, 31, 32°C), all falling within the heat stress category as per American Conference of Governmental Industrial Hygienists (ACGIH) standards. The mean skin temperature was determined using the Hardy du-bois 7-point model formula, which involved measuring the mean temperature of specific body parts of the 100 female farm workers. A variation of ± 0.5°C was considered due to the challenge of achieving precise thermal conditions in open field settings. The experiment aimed to evaluate the thermal and physiological responses of the participants. The findings revealed that the use of sun protection lotion alone resulted in increased cooling effect, thereby expanding the thermal comfort range. Additionally, the application of sun protection lotion alone reduced the mean skin temperature by 0.39, 0.38, 0.36, 0.30, 0.27°C by the end of the work period.