Fig. 4

PMA treatment effects on different microbial community types in previous datasets compared with the present study. Relative abundances of 30 taxa with the a largest and b smallest fold changes across different sample types from previous PMA studies on clean room dusts (Cleanroom_2016) [5], soil (Soil_2016) [2], and stool (Stool_2019) [10] and our representative office and transit built environments. In each study, samples of the same type were combined, with the relative abundance of each taxon calculated by averaging its abundance in all samples of the same type. Each pair of PMA-free and PMA-treated samples is linked by arrows pointing from PMA-free to PMA-treated average relative abundance. Taxa are highlighted using larger, darker circles when changes in the relative abundance are larger than 100-fold after PMA-treatment