I hooked this up through Deconz on Home assistant, and I’m definitely confused about what item is what on the output:
The PPB only showed up this morning 
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The ppb is definitely interesting. I don’t get a ppb numer via Zigbee2mqtt. The VOC Index is on a different scale, unfortunately not an absolute number in ppb so I wonder what that is all about…
Where is that button? On the device’s diagnostic panel in ZHA I only have an Identify button.
after updating to hassio 2023.10, the tvoc sensor created in this way:
sensors:
keittio_ilmanlaatu_tvoc:
friendly_name: “Keittiö ilmanlaatu TVOC”
icon_template: mdi:weather-dust
value_template: “”
and the automation suggested by @chendo give me back an error message
Any idea?
I am using ZHA with conbee 2
If you want (long term) statistics for the sensor, you have to set the device class. It will also show the history not as state changes but as a graph. Also, set unit to empty and the initial value to None so that it doesn’t try to interpret the empty string as a number on start and throw a warning:
vindstyrka_tvoc_index:
unique_id: vindstyrka_tvoc_index
friendly_name: Vindstyrka TVOC Index
device_class: aqi
unit_of_measurement: ''
icon_template: mdi:weather-dust
value_template: '{{ None }}'
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Thanks for this.
This solves my ‘entities not available’ when doing a quick reload.
Can I suggest that @jonixx updates their post with these changes to the template sensor?
I have a more general question. How to interpret these values: In ther morning they are normal because the window was open during the night. Then the values increase sharply until I open the window. What can cause these high values?
what you see is proprietary Sensirion’s VOC Index, basically it say’s when it’s rising that your VOC load increases while it decreases with an open window. these are no absolute values, but relative values. a value of 100 indicates that the VOC load (or „smell“) of the room is fine. values below indicate fresh air, open window (decreasing „smell“). the values are relative on a flexible scale and are supposed to mimic how our nose works/smells.
basically sensirion recommends to clean the air with a air cleaner/purifier with minimum fan power when the index is between 150 and 250, with medium fan power between 250 and 400 and maximum power above 400. or in other words: open the window when the index is above 400. values up to 300 like your graph shows should be absolutly fine (and only indicate that the room is slightly more „smelly“ than fresh air).
this is all explained in more detail in https://sensirion.com/media/documents/02232963/6294E043/Info_Note_VOC_Index.pdf
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OK. Thank you for your quick reply. I understand the values as such but I do not understand the source of the VOC load. Does it only come from my breathing? There are no other sources in the room but myself.
it’s a VOC sensor 
sources are anthropomorphic (sweating, breathing, farting, burping) but also evaporate from food or cooking, from solvents in cosmetics or disolved paint, after-shave and so on. more or less things that smell.
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For those who don’t speak or read German, this is the English equivalent:
Has anyone been successful getting one of these to connect with ZHA and an HA SkyConnect? I picked up a VINDSTYRKA last night and it’s been no joy on linking to HA.
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@Skyman64 Try factory-resetting the device by: “quick-press the pairing button 4 times to perform a factory reset”.
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Is there any way to improve the resolution on the temperature sensor? Seems like it is just an integer in degC, which is not very useful in tracking trends.
No. This is by design.
https://www.zigbee2mqtt.io/devices/E2112.html#device-is-not-reporting-with-decimal-points-precision
Good to know. I guess the only way would be if IKEA provides a firmware update.
Thanks for making me retry this. I had been doing longer and deliberate button presses and that wasn’t working but by going very quick, it linked right up.
I have two Vindstyrkas that I can’t pair to my HA. My gateway is a Conbee 2, and I just updated the firmware to the latest (0x26780700), but no joy. No matter whether I reset or long press, or whether I start searching from HA first or set the devices into pairing mode, they never seem to appear in the device list. Is there any good way to debug what’s going on?
Nevermind, it was a general ZigBee RF interference issue. Extending the dongle further away from the Raspberry Pi by adding a hub on the extension cord, everything cleared up. Vexing!