Are you breathing used air? Used air. What’s that? The air you inhale indoors may have been exhaled by someone else a short time ago. In fact, it may have been exhaled by many different people. It’s a scary thought, considering the viruses and germs that can be in the air these days.
How can you possibly know? Wouldn’t it be nice to have a “virus meter”?
There’s no virus meter, but there IS a quick and easy way to know how much used-air you’re breathing. It’s called a CO2 meter. You see, when people breathe out, they exhale Carbon Dioxide. Everyone does it thousands of times a day.
But with poor indoor ventilation, the CO2 from used-air builds up. And the more used-air you breathe, the more chance you have of getting sick.
This meter tells you how much. It’s simple: the higher the CO2, the more used-air you’re breathing.
In clean outdoor air, the CO2 is 400 ppm (parts per million). That’s normal. Indoors, CO2 levels can be much higher, because of all the used-air from other people.
In non-pandemic times, indoor CO2 up to about 1,000 ppm is considered pretty safe. But these days, under 700 ppm would be better.
Actual levels can be much higher, even up to 3,000 ppm!
You can carry this handy meter everywhere you go. It’s powered by two AA batteries (non-rechargeable), or by USB power.