Discover and read the best of Twitter Threads about #aranet4

Most recents (15)

#Aranet4 data logger capabilities allows one to simply calculate air changes per hour (ACH) by taking CO₂ decay data & plugging it in to a typical decay rate ƒ(x)

Facility manager says these meeting houses are safe to code & highly energy efficient! I agree w/ the latter! 😉
Using a spreadsheet for the function. Applied data to various time segments, including a 50 minute segment while HVAC was on (mid section of graph), noted a slightly improved ACH, probably just mixing air.
Corrrected... the 0.007 is actually air changes per minute... LOL

0.43 is air changes per hour.
Here is a link to the live spread sheet. (Make a copy for yourself before playing around with the numbers).…
Read 3 tweets
Spent the first day of the year 2023 at Disneyland. Daytime crowds were unusually sparser, probably from all the New Years Eve hangovers and the fact that it had been pouring rain from 12/31 until the AMs, but evening regained the usual crowd strength even with the dip to 45F ImageImageImage
It was an all-day masked indoors-outdoors marathon in @flo_mask and @masklabglobal KF series masks! I got pretty dented by the time I got home, but I'm full of churros and Mickey pretzels, so that helps ImageImageImageImage
My months-long shipment of random net and lace came in recently, so I was happy to be able to wander with a newly clothed @flo_mask mask for the new year. It's not at all a shade match for the decal, but good enough for me for right now ImageImageImage
Read 9 tweets
@sri_srikrishna @RanuDhillon @T_Inglesby @kprather88 @AbraarKaran My estimates were too aggressive, of sorts.

However I have seen no argument to disregard ACH's from natural ventilation, and significant natural ventilation is desirable: for low CO2. Also, a CR-box can certainly do a little more than 400 CFM, just at expense of more noise.

@sri_srikrishna @RanuDhillon @T_Inglesby @kprather88 @AbraarKaran Total CADR from #CorsiRosenthalbox'es needed to get to 12 ACH, given known natural ventilation:

900x8 classroom:
0 ACH ➡️ 1440 CFM
1 ACH ➡️ 1320 CFM
2 ACH ➡️ 1200 CFM
6 ACH ➡️ 720 CFM

900x10 classroom:
0 ACH ➡️ 1800 CFM
1 ACH ➡️ 1650 CFM
2 ACH ➡️ 1500 CFM
4 ACH ➡️ 1200 CFM

@sri_srikrishna @RanuDhillon @T_Inglesby @kprather88 @AbraarKaran Few thoughts on the numbers:
Natural ACH can probably be estimated with 'citizen science' and 'citizen math'.
Having to run a CR-box at higher speed is not an unfair 'price' of bad (less than 2 ACH) ventilation.
The best case of 6 ACH in a smaller classroom will be very rare.

Read 7 tweets
Einer unserer #Aranet4 war heute sehr umtriebig. Gut mit FFP2 bestückt war er in Museum, U-Bahn, Shoppingcenter, Food Court UND Kino.

Wie es so war, und welche Werte einem da an einem Wochenende begegnen, erfährt ihr gleich im 🧵
Los ging es wieder durchs schlecht belüftete Stiegenhaus und einem gemütlichen Spaziergang bis in den ersten Bezirk.

In der Albertina angekommen, verstauen wir ihn in der Garderobe - und vergessen ihn dort. Die Werte in den Nicht-Ausstellungsflächen 850 ppm sind eher mau. 2/10 co2 Wert Stiegenhaus - 1100...
Im Museum selbst, sind die meisten Besucher maskenlos unterwegs. Das stört uns wenig, wir versuchen einfach immer dort zu sein, wo am wenigsten Menschen sind.

Ohne Maske wäre es mir aber defintiv zu unsicher gewesen. 3/10
Read 10 tweets
#WHCADinner Screenshot of Apr 30, 2022

Bar lined up on y axis. Exiting car & making way to first meeting.

Private suite with 20 ppl. gradual climb.

1st drop, entering hallway prior to ballroom.

Burst, ppl entering ballroom at once. steady at 2000 ppm CO₂ ...

The dip, just right of middle, in the graph above 👆was an exit from the ballroom to the hallway, a restroom break.

Here the #Aranet4 sensor is on a table in an empty hall outside the ballroom.

#WHCADinner 2022
3/n A landscape view of the #ARANET4 graph.

The last hour of the event, CO₂ remained near 1700 ppm.

(outdoor reading in the neighborhood of the event via @cambecc atmospheric website showed CO₂ near 450 ppm)
Read 4 tweets
Articolo sull'attività svolta dalla Provincia di Bolzano sulla qualità dell'aria nelle scuole, e sull'uso dei sensori di #CO2 #Aranet4 nelle scuole ladine.
L'articolo chiarisce tutte le motivazioni legate all'importanza monitoraggio della CO2 e al miglioramento della ventilazione
Per chi volesse invece leggere su #RAINEWS l'articolo online sull'acquisto dei sensori #CO2 #Aranet4 per le scuole ladine (in ladino):…
Scuole Ladine "illuminate": un esempio da seguire da tutte le Regioni d'Italia, e che dovrebbe essere guidato dal nostro Governo, come tra l'altro già promesso (ma siamo a maggio e ancora niente...).
Read 4 tweets
The movement to bring #CO2 sensors to school empowers parents, students, & teachers to advocate for their health; Reveals invisible factors of air quality & helps see how well ventilation is matched to room activity.

Great article by @EmilyAnthes. (1/🧵)…
2/ If you are able to buy or borrow a CO2 sensor, stick it in the mesh water bottle pocket of your kid's backpack, pin into their shorts, or send in their lunchbox. Be creative. Make sure it isn't sealed away; the more airflow the better the reading.
3/ A key goal of #COVIDCO2 monitoring is to understand how well ventilation is matched to room activity & occupancy. Share the data with your school. If CO2 rises above 800 ppm, interventions needed to reduce build-up of aerosol & risk.
Read 19 tweets
1/ NEW CAMPAIGN: I'M HELPING @zerocovidthai (with generous support from @AranetloT) to DONATE CO2 METERS to SOUTHEAST ASIA

COVID-19 is mostly transmitted through the air, by breathing in infectious aerosols, in close proximity or in shared room air (…) Image
2/ For that reason, this is an indoor-dominated pandemic. It is much easier to be infected indoors than outdoors (…).

The best infection prevention strategy is do everything that you can outdoors
3/ But we have to go indoors at times.

Measuring the virus in the air is difficult, slow, and expensive.

CO2 indoors marks the presence of exhaled air, and serves as a proxy for the virus (cartoon from @numeroteca)

#covidCO2 Image
Read 32 tweets

Hasta ahora hemos donado 80, ~45 a Latinoamérica y ~35 a España.

Esos los hemos pagado con donaciones vuestras, de @AlejandroC_IQ, @citlanx, @EspanaAranet y mías
2/ @SAFTehnika, fabricante de los Aranet4, se ha enterado de nuestra campaña, y contribuye donando 51 Aranet4 más!

46 están en EEUU y pueden ir a Latinoamérica y comunidades hispanas (o de bajos recursos en Canadá y EEUU).

5 van a Europa, tratando de llegar a nuevos países
3/ Muchísimas gracias a @SAFTehnika por esta generosa contribución.

Y muchas gracias a @citlanx, distribuidor de Aranet 4 (…), que hace todo el trabajo de logística y los envíos voluntariamente sin coste.
Read 12 tweets
1/ Suicidio "Colectivo"

- Viaje en ómnibus
- Tiempo ~3 hrs 20 min
- Unidad: Ómnibus de la empresa @PlusmarOK
- Vol. ~70 m^3
- Ocupantes ~ 95% de cap total (39 piso superior)
- Medidor #CO2 #Aranet4 fijo 1-1,5 m del suelo (puesto 19)
- Ventanas cerradas con aire acondicionado
- Al ingresar, inmediatamente (2-3 min), se dispara el valor de CO2

- El ómnibus venía con 25/30 ocupantes antes de ingresar

- Antes de descender, el nivel había superado 2300 ppm de CO2

- El promedio en todo el recorrido fue arriba de 1200 ppm
La empresa comunica su protocolo:



❌NO EXISTEN AFOROS (en eventos cerrados se pide menos de 50% de capacidad como aforo)

❌Algunxs pasajeros SIN MASCARILLAS o MAL colocadas
Read 12 tweets
1/ A 🧵 on some #CO2 measurements in my home, car, school *AND* details/instruction on how to use dry ice for DIY estimate of #ventilation rates at your home or as a school project.

Highlights in thread & gathered together in the linked doc 👇. #COVIDCO2…
2/ Lots of good resources on using #CO2 as a rough measurement of #ventilation rates in your house, car, school, business. I.e. if CO2 < 800 ppm, generally fresher air, better ventilation. If CO2 rises, so does #COVID aerosol risk b/c of poor ventilation.
3/ #CO2 Example 1: Poorly ventilated minivan

Serendipitous obs of *really* high CO2 (4000+ ppm) w/ 2 adults/3 kids in car. Then one is #carsick & we crack 2 windows ~1”; CO2 drops immediately to ~750!

Interestingly, drive home had a) much lower CO2 & b) freshly cut tree in car! Image
Read 18 tweets
Short 🧵on #covidco2 readings in an elementary classroom in #UpstateNY. The teacher used an #Aranet4 to measure CO2 throughout the day.

1st reading, before students arrived, with windows closed.
Reading 2., 25 mins after kids arrived. 19 students and two adults in this room for the day.
3. 40 minutes after students arrived.
Read 8 tweets
Meanwhile in #France,
"the peak of this second wave is over"

(according to the President in his Adress to the Nation):
Wait... "the peak is over" doesn´t mean "it´s back to normal"!

Confinement will only fall on December 15,
if there´s less than 5.000 new cases a day.
(today it´s ~9.000).

France is disappointed.🙁

Although they certainly can make it happen.
Meanwhile in #Switzerland:
(excess mortality of the second wave is significant)

Good news: fastest decrease in infections happens in the worst hit areas now.
Read 2817 tweets
As #COVID19 cases are found to spread, #Melbourne (city of ~5 million) tries to contain them by going into #Lockdown.
(The interview features the idea of a dedicated #Quarantine building - that would actually help, I guess)...
"People acting as if the pandemic was over was 'not the answer, it is part of the problem' ".

"The virus had leaked from postcodes already under the stay-at-home orders to other parts of #Melbourne."
(and beyond, it is feared).
Due to #Melbourne's outbreak, neighbouring South Australia is about to completely close it's borders to #Victoria.

(Nearly) no exceptions. And those essential few who are allowed in, will have to wear facemasks the entire time...
Read 2915 tweets
Vorpommern-Greifswald district (where rejections of #Gütersloh residents took place, yesterday)
has specific rules:
"Those who return from international risk areas (out of Germany) or whose Corona-Warning App has alerted them, need to report to authorites" Image
In fact, Mecklenburg-Vorpommern's Corona-ordinance really prohibits entry of people from international risk areas AND german risk areas as well.
It's just not prominently featured on their websites.

(Overlooked that myself, hence deleted earlier tweet)… Image
People from #Gütersloh district may have to scrap all their holiday plans anyway...

An official #Lockdown is just being announced for the entire district.
(for one week, as of now)
Read 2556 tweets

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