Assessing Thermal and Ultraviolet Radiation Exposure in Playgrounds: A Comparative Study Across Taiwan and Jeju Island

Taiwan, situated between 22° and 25° latitude in a hot-humid climate zone, experiences higher ultraviolet (UV) radiation levels compared to higher-latitude regions. Despite this, many newly developed urban parks prioritize high sky view factors and use materials with high reflectance, which may inadvertently increase both thermal stress and UV exposure for children. Given their delicate skin and lower heat tolerance, children playing in these environments face dual risks from thermal stress and excessive exposure to UVA (315–400 nm) and UVB (280–315 nm) radiation.

While shading plays a crucial role in mitigating thermal stress and UV exposure, excessive artificial shading may limit children's engagement with nature, whereas material choices can inadvertently increase heat and UV reflection onto their bodies. Similarly, an overreliance on natural shading structures introduces challenges in maintenance and cleanliness. To address these complexities, this study investigates playground microclimates at different latitudes in Taiwan and compares them with Jeju Island, South Korea. By analyzing real-world measurements, the study examines how variations in latitude, material reflectivity, and shading strategies affect UV exposure and thermal environments.

Field measurements will be conducted under cloud-free winter conditions in three locations (northern and southern Taiwan and Republic of Korea), capturing UVA and UVB radiation levels alongside surface reflectivity and thermal conditions. The study aims to bridge theoretical expectations—where higher latitudes generally receive lower UV radiation but may exhibit higher UV reflectance due to material properties—with empirical data. The findings will inform climate-adaptive playground design strategies that prioritize children's health and well-being, ensuring resilience against increasingly extreme climatic conditions.