I have an airq (highend air quality measurement device) sitting next to the dyson fmdhyde purifier - and trying to understand the mapping - of dyson voc stages (green to read, 1 - 
to pbb I am getting from the other measure device.
The below seems to suggest that that 0-1 switch happens at ~500pbb
duplicate of
How VOC scale in ppb defined in Dyson Purifier? | Dyson Community
so maybe someone from the dyson community can close this one?
New here? Register below. To activate you account and be able to post on the community, don't forget to click on the link in your activation email.
No account yet? Create an account
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.