Eczema, facial erythema, and seborrheic dermatitis symptoms among young adults in China in relation to ambient air pollution, climate, and home environment.

Abstract

A questionnaire survey on dermal symptoms and home environment was performed in eight Chinese cities (40279 participants). Data on city level temperature, precipitation, PM10 , NO2, and gross domestic product (GDP) per capita were collected. In total, 2.2% had eczema, 2.4% facial erythema (FE) and 2.6% seborrheic dermatitis symptoms (SD). Higher temperature was associated with eczema (OR=1.09). Higher GDP per capita was related to less SD. Higher PM10 was related to SD. Suburban living was protective for eczema (OR=0.77) (vs. urban). Living in old buildings (built before 1991) was related to eczema (OR=1.42). Living near heavily trafficked roads was related to FE (OR=1.33) and SD (OR=1.35). Having new furniture was related to all symptoms (OR=1.26-1.47). Burning mosquito coils (OR=1.37-1.57) and incense (OR=1.33-1.37) were associated with eczema, FE, or SD. Presence of cockroaches and rats/mice was associated with FE or SD (OR=1.31-1.40). Using air conditioner, daily cleaning and frequently exposing bedding to sunshine were protective (OR=0.60-0.83). In conclusion, higher temperature, higher PM10 , urban living, living near heavily trafficked roads, old buildings, new furniture, burning mosquito coils and incense, and presence of cockroaches/rats/mice increased the risk of eczema, FE, or SD. Higher GDP, air conditioner, daily cleaning, and exposing bedding to sunshine were protective.