Airborne PM derived from feedyards facilitated dispersal of several veterinary
antibiotics, and microbial communities containing ARG. Concentrations of several antibiotics in airborne PM immediately downwind of feedyards ranged from 0.5-4.6 μg/g of PM. Microbial communities of PM collected downwind of feedyards were enriched with ruminant-associated taxa, and were distinct when compared to upwind PM assemblages. Furthermore, abundance of genes encoding resistance to tetracycline antibiotics was significantly greater in PM collected downwind of feedyards as compared to upwind.