My Dyson sir purifier always used to have a number on the screen on the device that would show at a quick glance what the air quality was like. If we sprayed perfume or deodorant for example the number would go up. This has now disappeared and there is just a flat green line that never moves. How do I get the number back?
Hi
Welcome to the Dyson Community!
To scroll through the information being monitored by your Dyson purifier, please press the ‘i’ Information menu button on your remote until you find the screen you want to see.
In normal use, when your machine’s sensors detect a particular type of pollutant which causes air quality to decrease, a symbol for the pollutant will show on the LCD screen.

Hope this helps!
Hi
Try using the Information button to scroll to the screen labelled ‘PM 2.5’, then wait for 5-10 seconds. This should then show a live particle count.
Is this the numbers screen you were referring to?

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