Characteristics of and variation in airborne ARGs among urban hospitals and adjacent urban and suburban communities: A metagenomic approach.

•A total of 643 ARGs subtypes belonging to 22 different ARG types were identified.•The profiles of ARGs shown a city functional region dependent pattern.•Airborne ARGs from the hospital exhibited higher ARG abundance and richness, may be the hotspots of resistant genes of multidrug and quinolone.•Environmental ARGs from suburban community could be explained by human fecal pollution, and crAssphage could be applied to predict the abundance of ARGs.