Learn the difference between pollution masks and respirators. Pollution masks, like Nirvana Being’s N95/N99, block PM2.5 for city use. Respirators shield against chemicals and biohazards in risky environments. Pick masks for daily wear or respirators for intense exposure based on your needs https://nirvanabeingmask.blogspot.com/2025/04/respirators-vs-pollution-masks-which.html