I must say i hope the NO2 sensor is broken. The results have me worried.
The green grap are the values of Air-Q sensor. Other values are measured by the goverment, about 500m from my house.
Is there a health risc in my home? Or is the NO2 sensor defect?
In my device the NO2 values are a bit worrying to be honest.
Since no2 value is so high, i decided to build a dashboard with inside (=air-q) and outside (goverment samplers) measurements to track and compare. As it is important, i also use precense, window and ventilation statistics for context.
For NO2 there used to be a strong correlation between humidity - this has been resolved by a firmware update. I think
The most obvious cross contamination is see at the moment is ozone - which is problem because my device (air-q basic does not have an ozone sensor).
After a peak (ozone measured by goverment 500m from my house - outside), a peak in NO2 is reported:
I will post again in a week or so, after i have collected some more data.
full dashboard at the moment:
Using IOS 15.5
[Beta] feature 'activate push notifications': spinning doughnut - have to hard exit the app.
starting the application: always starts with default 'welcome screen'. at first i thought i had to log in each time. But if i click setup new air-Q > skip setup > to the dashboard it works as well (dashboard shows my device). Seems like a variable 'initialised' is set to false, while it should be true. If i remember correctly i added the air-q manually - or at least from the dashboard and not from the 'welcome screen', as this is not the intended default flow that might have been the cause.
high latency in navigation to device. this 'feels' unpolished. The app is unresponsive for a second or so when loading device details, both from dashboard to details and from single measurement details back to device details
I currently use OpenHab to integrate with homekit.
Aside from the Air-Q devices I get oudoor values from https://aqicn.org/.
These are also shown in Homekit.
Currently trying to automate my Zehnder ventilation unit based on air-q measurements, windos/door state, precense, fire alert, ....
If i understand correctly you should always add relative humidity to any evaluations of NO2. If NO2 spikes correspond to humidity spikes (with a slight delay) - the measurement value is not to be trusted.
Showers, making coffee, doing the dishes,..... will increase humidity might affect relative humidity and could explain the spikes.