The disparities in health risks of multiple pollutants through soil and dietary exposure in a rural-urban area based on accessibility method

Rapid urbanization has resulted in disparities in environmental conditions for different communities in suburban area. This study presents a comprehensive investigation into the occurrence of pollutants in the soil and dietary food, and associated health risks in an urban-rural transitional area. The levels of potential toxic pollutants, notably metals, organophosphate esters (OPEs), and agrochemicals in surface soil and dietary food were evaluated. Higher levels of metals and OPEs were found in soils of industrial area, and agricultural soils had an elevated level of agrochemicals. The highest health risk was found for Chromium (Cr) which exceeded 1, indicating a high probability of adverse non-cancer effect to local residents. The levels of contaminants in food showed higher variability in community market and farmers' market than in supermarket, while higher levels of OPEs were found in food from supermarkets. The accessibility to fresh food mainly determined the differences in health risks of different communities. For dietary exposure, residents of industrial areas have higher levels of risk than other neighborhoods, mainly due to the possibility of exposure of foodstuffs with higher metal contents. In terms of market type, community markets mainly contributed to the comprehensive health risk through dietary exposure, especially for industrial and agricultural communities. The findings of this study provided further understanding of the spatial distribution of various contaminants as well as their health risks for different communities, which could guide the monitoring and management of potential toxic pollutants to safeguard public health in rural-urban transitional regions.