I was on a flight two days ago from Miami to Toronto, cutting my trip short due to this coronavirus situation.
For the first time, I brought onboard one of Air Quality Canada Inc.'s air sensors... and it turns out that what I had been reading about airplanes having good air filtration systems is true!
Humidity - 13%
CO2 - 1014ppm
Chemicals - 20ppb
PM2.5 - 0 ug/m3
The CO2 level was pretty acceptable considering the number of people in such a tight space. For reference, when I brought the air sensor on a GO bus, the CO2 level was about 1400, and most people's homes sit at at about 800. But this is ventilation-related, nothing to do with the air filtration system.
The metrics we care about when assessing an air filtration system are the Chemicals and PM2.5 (airborne particulates). I rarely ever see a PM2.5 of 0, not even in places with air filters present... Pretty Impressive.
Where the air quality of an airplane really suffers is in the humidity. Remember to stay hydrated while on a plane!
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