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Playing devil's advocate, this device is obviously made for mass market($11.99), what if the WHO/AQI "Good" numbers are too hard to achieve for general consumers?, the buyers of this device might be venturing into clean air for the first time and the last thing they want to see is "orange/red" ALL the time.

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I bought three Vindriktnings when they came out, and on a day when we had some wildfire smoke making outdoor air quality around 150 put all three outside. Two went yellow then red, while the third stayed green... I guess I'd prefer a false positive to a false negative personally. It's true, they only cost me $13 each, so not a huge loss but it does suggest there are quality control problems with either the sensor or the whole device.

I think it's folly to try to cater for the type of person who buys a product, has it identify an issue, then blames the product for identifying the issue.

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