If we are to assume masks are 80% effective in preventing spread on an individual basis, the overall risk-reduction in a single interaction between two people should be 96%.
SURGICAL MASKS
prevent infection of viruses like the coronavirus (Covid-19), as well as more sophisticated N95 masks. A simple surgical mask blocked 80% .007 microns (even smaller than viruses).
The CDC recommends that members of the public use simple cloth face coverings or Surgical mask when in a public setting to slow the spread of the virus.
N95 AIR MASKS
Masks that come with an N95 rating can filter up to 95% of the particulate matter 2.5 from the air you breathe. An N95 respirator face mask removes particles from the air that are breathed through it. These respirators filter out at least 95 percent of very small (0.3 micron) particles. These masks are capable of filtering out all types of particles, including bacteria and viruses. N95 face mask is the best way to protect your lungs and overall health. Built to filter out dangerous particles, the N95 is a better way to breathe clean air and stay healthy.
The "N-95 medical mask" is intended only for medical staff working in places where infected patients are being treated.
P95 AIR MASKS
The major difference between P-rated and N-rated air masks is their ability to filter out oil-based pollutants, which the former can while the latter can not.
The P-rated masks are more efficient as well as more expensive than their N-rated counterparts and have to be replaced after approximately 40 hours of usage too.
N99 AIR MASKS
N99 air masks can filter up to 99% of the particulate matter 2.5 from the air. Just like the N95, they don’t work well against oil-based pollutants, but are better than the former because of the higher filter rate of particulate matter.
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