Product review (1 stars): Pollutes the air
My Dylos DC 1100 air monitor goes off the charts with these filters.  From < 100 small particle > .5 nm to  to over 2000+.  That's air quality excellent to poor in a matter of minutes with one of these new filters in a freshly cleaned humidifier.  It does not get better with filter age.  Note, you will smell this problem when you start up the humidifier, but will stop smelling it after your nose gets used to it.  My air quality monitor always picks it up though.