David Elfstrom 🍁Sep 8, 2020
Calibrated and ready to go! #covidco2 logging down to 1-second intervals. Local schools are back next week, will try it in a science classroom. Meanwhile, time to play at home! @HOBODataLoggers MX1102A Carbon Dioxide logger
Show threadDavid Elfstrom 🍁Dec 31, 2020
Preventing Airborne Transmission of SARS-CoV-2 in Hospitals and Nursing Homes Int. J. Environ. Res. Public Health 2020, 17, 8553. Link: https://doi.org/10.3390/ijerph17228553 Mentions #COVIDCO2 measurements, #aerosol, relative humidity, avoid hydrogen peroxide cleaners
Preventing Airborne Transmission of SARS-CoV-2 in Hospitals and Nursing Homes

The first case of the coronavirus disease 2019 (COVID-19), the novel contagious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), was reported in Wuhan, China in December 2019 [...]

MDPI
David Elfstrom 🍁Sep 18, 2020
Good #covidCO2 site: Small room with 1 person for hours. 90sqft, 890cuft, 505ppm 22C, Low RH 27%. Outdoors is 15C 29%. High internal gains = AC on. No operable windows. 1980's design. Humidity will be a problem this winter.
David Elfstrom 🍁Nov 20, 2020
Canada has been developing new residential indoor CO2 limit of 1000 ppm for #IAQ (non-pandemic). Read the draft here: https://www.canada.ca/en/health-canada/programs/consultation-residential-indoor-air-quality-guidelines-carbon-dioxide/document.html #covidco2 @spaiglass H/T Andy...

Consultation: Proposed Residen...
David Elfstrom 🍁Nov 12, 2020
#COVIDCO2 looks good in this classroom so far https://https://t.co/9ksBNjlbwY
David Elfstrom 🍁Nov 16, 2020
The effect of air infiltration on CO2 in the home. Normal level is 1240 ppm for our family of four with windows closed. Home has no principal ventilaton fan. Now with wind steady 42 km/h, gusts to 70, we are getting 941ppm: unintentional ventilaton. #buildingscience #covidCO2
David Elfstrom 🍁Nov 19, 2020
#covidco2 Afternoon dental office CO2 measurements: Waiting room / reception 1150ppm. Operatory with door closed and two people reached 1425ppm then the door was opened. Small tower portable air cleaner in the room, large unit in the hallway with UV.
Show threadDavid Elfstrom 🍁Dec 3, 2020
#covidco2 https://www.tijd.be/dossiers/coronavirus/scholen-kopen-massaal-co-meters-tegen-corona/10269345.html

403 Blocked
David Elfstrom 🍁Dec 14, 2020
#COVIDCO2 measurements: Dollar store, short drive, pharmacy. Dollar store peaked at 1300 ppm, didn't stay to see it go higher. Logged in 10 second intervals with HOBO MX1102A. Both stores had approximately the same occupant density (not crowded) & age of construction.
David Elfstrom 🍁Dec 14, 2020
#COVIDCO2 Quick reference table of rebreathed fraction of air from CO2 measurements, assuming office work levels of oxygen consumption