I don’t think using the brand new WHO guidelines is very fair. Not sure when it was released, but regardless this product was likely completely designed and manufactured before the WHO guidelines were published, just a few months ago.
Also, Airnow.gov still has a published scale that is worse than the IKEA product. https://www.airnow.gov/aqi/aqi-basics/. Green is 0-50, Yellow is 51-100, Orange 101-150, and Red 151-200.
So I’d guess most air sensors on the market aren’t necessarily classifying their readings into green-good / red-bad, or at least come with a now-outdated chart. Are there sensors that have been released and/or updated to match the new guidelines already?
Also, Airnow.gov still has a published scale that is worse than the IKEA product. https://www.airnow.gov/aqi/aqi-basics/. Green is 0-50, Yellow is 51-100, Orange 101-150, and Red 151-200.