Investigating the impact of urban landscape composition and configuration on PM2.5 concentration under the LCZ scheme: A case study in Nanchang, China

•Integrating LCZ scheme to analyze the effects of landscape composition and configuration on PM2.5.•Built categories demonstrate higher PM2.5 concentrations than natural categories.•High/compact built classes demonstrate higher PM2.5 concentrations than low/open built ones.•HRE and AR are the top two significant landscape configuration metrics affecting PM2.5.•Effects of landscape composition and configuration on PM2.5 is season-independent.