How effective are different types of face masks? Laser shows how.

the blue paper mask you see everyone wearing is perfectly fine.

do all the other measures too.

Is there some way of measuring the CO2 you're breathing back in while you have the mask on?


carbon dioxide poisoning

Poisoning caused by inhalation of carbon dioxide (CO2). In small quantities (up to about 5%) in inspired air, CO2 stimulates respiration in humans; in greater quantities it produces an uncomfortable degree of mental activity with confusion. Although not toxic in low concentrations, CO2 can cause death by suffocation. Poisoning is rarely fatal unless exposure occurs in a closed space.
[link to medical-dictionary.thefreedictionary.com (secure)]

Which is why only if you are sneezing and coughing you need a mask better yet stay home

no symptoms = no mask

Nope. You can exhibit no symptoms yet carry the virus. Masks can protect others from you if you are asymptomatic.

there is only the volume of CO2 from the very last moment of exhaling.
as you are exhaling the CO2 is not compressing and collecting
inside your mask; it is being pushed out of the mask by
the CO2 behind it.

what is left inside the mask by the time you take your next
breath is next breath, is negligible. the lung are always filled with CO2.
the Lungs only collect and absorb the Oxygen and expel the rest.
you are not taking in anywhere near the CO2 to displace
a significant amount of the incoming 20% Oxygen (in normal air).

don't worry. you'll know it when you are suffocating.

Carbon Dioxide Poisoning means: there is a Large
volume of CO2 present, in the available air, that
is displacing the spaces that are normally filled with
oxygen in the the ambient air.

that is different from Carbon Monoxide Poisoning, CO,
because the Carbon Monoxide is actually absorbed into
the blood stream and it chemically bonds with the blood cells permanently,
so that the normal oxygen present has no way to transport itself around the body.

(that's a special kind of Suffocation)