Respirator or dust mask?

What type of breathing protection should you use if you have to work near a source of water that has tested positive for Legionella? Will a dust mask, type 3M 8210, be ok or do you need to wear a respirator?

If your work involves aerosols of water or mist, then a P95 respirator is ideal. If it does not, then a dust mask is ok. Breathing aerosols of water vapor or drinking the water can lead to Legionnaires’ disease. Touching the water is not a risk.