4/ Still waiting to board. Impressed with @DENAirport terminal ventilation, despite crowding
5/ Settled at our seats, we were able to board early.
Improperly masked @lufthansa flight attendants asked us to remove our elastomeric N95 masks and put surgical masks instead (!!). We refused and were able to convince them that these are real N95.
7/ CO2 during the flight hovered around 1200-1600 ppm. Not as bad as what others have repo on other airlines, and with the filters the risk is lower than it would appear w/ CO2 alone.
8/ Munich airport @MUC_Airport. CO2 ok, although we are in an area with very few people.
15/ Planetarium at @CosmoCaixa, at the end. Half full, good ventilation
16/ Checking that the CO2 mitor is well calibrated with the outdoor concentration. Makes sense since today is pretty windy in Barcelona.
17/ Starting a 2 hrs train trip on the Spanish high speed train (AVE @AVEMadBcn) from @Renfe. 70% occupancy.
Increasing, we'll see how high it gets
18/ I try to eat at a different time than others, ideally before. I have a water bottle with a straw type connection (pic) that I can slip under the mask.
But you have to accept some risk while traveling (or not eat and drink, that'd be too much for me)
21/ @Movistar mobile phone shop in Zaragoza. 12 people in a large shop. Not great given few ppl, but not too bad.
22/ From the same @Movistar phone shop. Ventilation wasn't great, but they had signs on the phone displays that you should not touch the phones before someone disinfects them for you...
Stuck in 2020, despite ZERO demonstrated cases of surface transmission & DOMINANT airborne...
23/ Checking the comparison with a similar meter, which is an easy way to check that the measurement is likely correct.
Normally within 30-50 ppm would be good, these 2 being so close is great but better than typical.
Also signs saying that it is ok to remove the mask when climbing, when that's the most important time to wear it! Higher aerosol emissions and inhalation when exercising...
26/ Same gym, completely outdated protocols, with high emphasis on disinfection. Despite ZERO proven cases of surface transmission.
Nothing about airborne transmission, other than masks. No specification of type. Many mediocre masks.
Just an example, same almost everywhere...
27/ Restaurant El Lienzo in Ávila, Spain. Eating outdoors w/ family. Indoor well ventilated 625 ppm.
But bathroom doesn't have ventilation, seems to be a problem in many places.
28/ @aeropuertoMAD, good ventilation as in other airports.
But the still emphasis in useless disinfection measures
Not rush hour, but quite a few people. Some small windows are open. I think there is some filtration, so Ok but not great.
Everyone masked, although many poorly fitting surgical or KN95 (nose esp.). Few ppl talking. Overall low risk
30/ At the Zaragoza @zaragoza_es train station. Huge building, good ventilation due to openings for trains to go in and out (plus other systems). Same levels as outside, very safe.
31/ Just jumped into the train @Renfe@AVEMadBcn. Completely full, plenty of mediocre masks such as surgical band even cloth. Some masks below the nose.
And horrible ventilation...
• • •
Missing some Tweet in this thread? You can try to
force a refresh
1/ New paper in @ScienceMagazine: "Mandating Indoor Air Quality for Public Buildings"
Explaining current status of indoor air quality standards (in short: bad or non-existent), the huge health benefits that would arise from them & proposing a path forward science.org/doi/10.1126/sc…
2/ "People living in urban & industrialized societies, which are expanding globally, spend more than 90% of time indoors, breathing indoor air (IA)."
"Most countries do NOT have legislated indoor air quality (IAQ) performance standards for public spaces"
1/ Measuring CO2 indoors in a 10 day trip from US to Europe & back
Bus @RideRTD to Denver airport, poorly ventilated as usual.
We have not left town yet! In previous trips it kept increasing, we'll see this time.
2/ For background on what CO2 indoors indicates and more details, see
TLDR:
- We exhale 40000 ppm CO2
- Outdoors: 420
- Each 400 extra ppm indoors = 1% extra rebreathed air
- CO2 makes us dumber, indicator of virus & pollutants. Does not capture filteringdocs.google.com/document/d/e/2…
3/ Or by reducing recirculation. Some recirculation is ok if well-filtered, saves energy.
Energy-recovery ventilators allow ventilating well with limited energy use.