Donate A MaskDo you have an Aranet4 already? Get the Aranet4 Air Quality Sticker, which is on sale for $1.99. 🎉 The sticker provides helpful reference information and adds some fun.
Get yours today! Sale ends May 23. 🗓⏰
Closed windows due to smoky air can increase the concentration of carbon dioxide (CO2) indoors. 🏠 Keep an eye on indoor CO2 levels with the Aranet4 Home Edition, on sale now for $269.99.🎉
Don’t miss out! Sale ends May 23.
Phil Tanner 
Just back from watching Sgt Haane (https://www.nzfilm.co.nz/films/sgt-haane) at the cinema.
For once, i remembered to take the #Aranet4 with me. Can you tell when it was in the cinema?? 😱
Jeff Forcier
Mike McCaffrey 
My biggest takeaway from traveling for a month with an #Aranet4 to monitor CO2 levels as a proxy for #covid risk, is that air conditioning gives you a false sense of security.
I was on a packed subway train that was stuck for 20 mins, and while the train was stopped with the doors open, the CO2 levels didn't go above 700ppm, despite feeling hot and stuffy. When the doors closed and the AC kicked in, the CO2 levels tripled, despite feeling like there was much more ventilation.
Haven#AskFedi #IAQ #CleanIndoorAir #HVAC folks:
My apartment's HVAC system, which is connected to an individual rooftop unit with its own fresh air intake ducts--is currently down. My understanding is that the issue is with the control module that is connected all the in-apartment on this floor, so all of our units are turned off.
I have a CR box air purifier, and a small portable one with miniature #HEPA filters, and an #Aranet4 air quality monitor.
Maintenance have installed a one-hose portable AC unit, with thermal tape around the edges of the open window. From the perspective of minimizing aerosol concentration, what is the best approach with respect to fan speed/mode options, i.e., always on, or only when cooling; blocking the undercut in the door, and opening a window in a different room?
I had also considered not using the portable AC at all; minimizing opening of the door and venting via windows with colder air at night.
Mike McCaffreyReally happy with the ventilation at #Drupalcon! CO2 levels in the sessions have been barely above the baseline outdoors. Look at how much lower the levels were when giving my session compared when I was sleeping overnight alone in a room.
Lu 🇦🇲
KanaMaunaOh look, it’s only 90.8°F during the winter. Totally normal for the San Francisco Bay Area. And why is the CO2 reading 100 ppm higher than normal for outdoors?
Sebastian MüllerWelchem CO2 Sensor glauben wir jetzt?
🫎 #Ikea #Alpstuga mit 401 ppm
🏛️ #ApolloSensors #MSR2 mit 327 ppm
🔺 #Aranet4 mit 496 ppm
🌋 Mauna Loa Observatory, Hawaii: 429.29 ppm
Kann es sein das 6. Stock, Stadt und ca 3 C Temperatur die Messung verzerren?
Wie kalibriert man am besten?
