I am anti-mask (because they don't work) but the volume of a normal breath is half a liter, and maybe 20 ml of that will be rebreathing. So if the indoor air is 1000 then (1000 * 480 + 5000 * 20)/500 = 1160 which is actually higher than I thought it would be but probably isn't terribly concerning. But since they don't work it's not like you're getting anything in exchange for the slightly higher co2 levels.
No, it won't. 96% of the air will always be from outside the mask so it will quickly reach a steady state. And I used your number of 5000; if it would rise over time you would have seen it rise and reported a higher number.
I am anti-mask (because they don't work) but the volume of a normal breath is half a liter, and maybe 20 ml of that will be rebreathing. So if the indoor air is 1000 then (1000 * 480 + 5000 * 20)/500 = 1160 which is actually higher than I thought it would be but probably isn't terribly concerning. But since they don't work it's not like you're getting anything in exchange for the slightly higher co2 levels.
That might be your first breath, but over the course of a minute the numbers continue to rise
No, it won't. 96% of the air will always be from outside the mask so it will quickly reach a steady state. And I used your number of 5000; if it would rise over time you would have seen it rise and reported a higher number.