Dear Deutsche Bahn, please improve air quality in your trains #railInEurope #ICE #DB CC: @jon
If COVID is now endemic, it's time to discuss permanent changes to the way we behave - like wear-a-mask zones on long distance trains - Jon Worth Euroblog

Christian Drosten has today stated that the COVID pandemic is over, and the virus is now endemic. That has led, rather predictably, to the demand that all Corona protection measures be lifted in Germany – FDP Justice Minister Buschmann was the swiftest to make this demand today. But that COVID […]

Jon Worth Euroblog
@jon @jmovs May I ask the brand of the detector you're both using?
@Pepijn @jmovs Protmex PTH-4 or PTH-5 (5 can also do temperature and humidity readings). Can highly recommend it - it's small, cheap-ish, and good enough! Just make sure you calibrate it correctly.
Aranet4 - CO2 monitor

The perfect companion for indoor environments allowing you to monitor CO2 levels, temperature, relative humidity and atmospheric pressure

Aranet
@DominikTo @Pepijn @jmovs Yes. It costs considerably more. I checked it when I bought the Protmex - I don't need the extra accuracy, or the data to be downloadable. If you do I am sure it's ace.

@jon @DominikTo @Pepijn @jmovs

I've bought this one from Dostmann, €70. It seems reliable, and I can read the data on my computer via USB. I also bought a UBB-c to micro USB cable to measure the CO2 level outside. The CO2 level was okay on an ICE to Hamburg last weekend.

@jon @DominikTo @Pepijn @jmovs

The train was coming from Munich to Hamburg. At the central station, in Berlin, while the doors were open for a few minutes, it dropped to around 500 ppm, which is quite good. After around 1,5h, it increased to 936 ppm. I think we had around 33% of occupation on my wagon.

There is some air circulation, but it should be better. Once, my train go stuck and was almost full. The Co2 level almost reached 3000 ppm.