I don't know if anyone has done a study of the prevalence of humidifier lung with different types of humidifiers, but I'd bet that the common ultrasonic ones are the worst and it wasn't surprising to me that the model in the linked case was ultrasonic.
I've used ultrasonic humidifiers in the past and clean them well enough to avoid humidifier lung, but stopped when I noticed the air quality sensor on my air filter would go nuts when using the humidifier with anything other than distilled water. Which makes sense in hindsight, since any ultrasonic humidifier is essentially blasting everything in the water all over your house. Any contamination in the humidifier or the water is going straight into your lungs.
Steam and evaporative humidifiers have their own downsides, but their respective processes of producing water vapor seem to carry less non-water things with it. Which again makes sense given the physical processes involved.
I've used ultrasonic humidifiers in the past and clean them well enough to avoid humidifier lung, but stopped when I noticed the air quality sensor on my air filter would go nuts when using the humidifier with anything other than distilled water. Which makes sense in hindsight, since any ultrasonic humidifier is essentially blasting everything in the water all over your house. Any contamination in the humidifier or the water is going straight into your lungs.
Steam and evaporative humidifiers have their own downsides, but their respective processes of producing water vapor seem to carry less non-water things with it. Which again makes sense given the physical processes involved.