Many “formaldehyde detectors” actually react to a large group of gases, including harmful and harmless gases.
If you have a tester, try a little experiment: eat an orange near the tester. The detector will probably send out an alarm.
For your newly renovated home, if you can smell that chemical, remodeling smell, you’ve got a problem. Don’t waste time and money testing. The US CDC says we should start worrying about formaldehyde at 0.1 PPM, precisely the level that most humans can start smelling it.
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