I’ll do my little PSA of: your “cool mist“ or ultrasonic dehumidifier is pumping your air full of particulate pollution. I’ve measured this myself, unintentionally, by putting one in my daughter’s room where I already had an air quality sensor. The PM2.5 soared.

Don’t put these in a bedroom! Probably avoid them entirely, and used a steam humidifier if you need the functionality.

https://www.technologynetworks.com/applied-sciences/articles...