Indoor Air Guides

The WHO indoor guideline for formaldehyde is 0.1 mg/m3 over 30 minutes (about 0.08 ppm). Here’s what that means, how mg/m3 converts to ppm, and how to read a home monitor.

How to test for formaldehyde at home with a handheld detector: which rooms to check first, how to get a steady reading, and what to do if the number is high.