I am not sure if it can be measured as you would have to removed the mucus from it first. Hopefully with environmental laws it shouldn’t be as much as it was in the 1950s. My guess would be less than a gram.
Not sure at all….I guess you do collect more in the city compared to the country side due to the pollution in the air….but how much …I do not know….I notice if I come to London for the day and I blow my nose what comes out it is much darker than if I did blow my nose in the mountains!!!!
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