Difference is where they are certified. https://coronavirus.health.ok.gov/kn95s https://coronavirus.health.ok.gov/kn95s there are articles abound when you goog

Difference is where they are certified. https://coronavirus.health.ok.gov/kn95s https://coronavirus.health.ok.gov/kn95s there are articles abound when you google "kn95" of up to 70% being not up to snuff