People don't understand ppm like they do temperature units. These rebreathed stickers can help drive home the point. Especially when the next respiratory virus

People don't understand ppm like they do temperature units. These rebreathed stickers can help drive home the point. Especially when the next respiratory virus season rolls around. https://naltic.com/product/aranet4-rebreathed-percentage-sticker/ https://naltic.com/product/aranet4-rebreathed-percentage-sti... You will take ~ 1000 breaths per meeting hour. really gross!