Review on 📊 WICHEMI High-Precision Formaldehyde Recording Solution by Justin Hollins

We use it for PM 2.5 and PM 10. My house is in the middle of a very smoky day with wildfires. Need a mask to go outside and a little better inside. Local Purple Air readings as well as Airnow readings are 280-350 PM 2.5 (and higher) - "very unhealthy". This reads 53 on the outside and 22 on the inside. Excellent air. Well it's a joke.