Hi there!
I have recently purchased a Dyson AirPurifier formaldehyde.
When I first got it, the display was never anything more than the green rating, apart from when I cook.
Now for the last few days, I haven’t really seen it in the green rating, it’s now in the yellow…
When I now have it on auto, the fan is going at a fast speed. I’m a bit confused as to why my air quality is now worse than before when I’m doing nothing different.
(Moderation Edit - Tags Added)
Have you tried gently cleaning the sensor vents? I use the soft dusting attachment on my cordless vac. Failing that are there any constant sources of VOC’s nearby like reed diffusers / candles?
Have tried that, did exact same thing as you and still hasn’t helped.
I do have candles but rarely ever light them. They were here when I first got the purifier and when it was always showing green.
This is just from today… I’ve done only something in the toaster.
Hey Darlin!
Sorry that I’m butting in. I thought I’d share with y’all that mine does this when I have those vaporising plugs in use. I note yours is quite yellow when there is a hike in VOC. Have you read up on the cause? I was thinking to myself this might help y’all out! Why am I seeing an increase of VOC in the winter months? | Dyson Community
Lemon 
Hi
An intriguing topic.
Other members have made great suggestions. If I may share my own, I recommend becoming familiar with these community topics:
These should broaden you’re understanding of Air Quality and how it is effected by the surrounding environment.
David.
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