Stephanie Holm, a pediatrician, environmental epidemiologist and co-director of the Western States Pediatric Environmental Health Specialty Unit at the University of California, San Francisco, says that currently there is a lot of interestbut also a lot of confusionabout how well different mask materials filter out particles
Product Quality Arguably one of the most obvious giveaways, if a product looks and feels poorly built (lightweight, things rattling about inside, cheap material, etc) its probably a fake
Over 35 and smoking fewer than 15 cigarettes/day: the risks of using the combined pill, patch, or ring outweigh the benefits, and therefore, this method should be avoided
When the air outside is bad, opt to recirculate
Methodist DeBakey Cardiovascular Journal
Source: Golder S, Hartwell G, Barnett LM, et al