You misunderstood my post. I have emphysema and care about the air quality. I never said PM2.5 causes it.
Since you ask, a quick google says: -
Recent epidemiological studies have revealed that PM2. 5 increased the incidence and prevalence of COPD during long-term exposure. Ambient concentrations of PM2. 5 was strongly correlated with lower pulmonary function and increasing emphysema, even at relatively low concentrations
https://pmc.ncbi.nlm.nih.gov/articles/PMC10086390/#:~:text=Recent epidemiological studies have revealed,COPD during long-term exposure.&text=Ambient concentrations of PM2.,even at relatively low concentrations.