Oh SJ, Yoon D, Park JH, et al. - Researchers intended to determine if there is an association between particulate matter (PM) concentration and objective skin changes in healthy individuals. The sample consisted of 25 healthy volunteers without any skin disease. For 14 days, data regarding daily meteorological parameters and air pollution were collected during a high-PM period and a low-PM period. In addition, environmental and lifestyle factors that might influence the skin conditions of individuals were obtained during the study period. According to this prospective study, even in healthy human skin, increased PM concentrations may contribute to disturbed barrier function, increased facial erythema, and uneven skin tone.