When structural immune cells and asthma deteriorate, TGF-β1 expression increases in the airway epithelial, which is the main expression area [35,36] Because, PM2.5 has a wide impact on human health [37], it is very important of research to evaluate the improvement effectiveness of YG-1 extracts in PM2.5 inhalation acute lung inflammation-causing mice. Here, TGFB1 is linked to asthma.