Air Pollution and Child Obesity: Assessing the Feasibility of Measuring Personal PM2.5 Exposures and Behaviours related to BMI in Preschool-aged Children in China

•China has one of the worst air pollution levels in the world.•Air pollutants are endocrine disrupting chemicals that can increase obesity risk.•We presented novel and feasible methods to measure air pollutant exposure and obesity risk in young Chinese children.•We provide evidence to justify conducting epidemiologic studies of environmental risk factors for child obesity in China.•This study informs future research studies on environmental pollution and chronic metabolic diseases.