Humidifier(s) will help you to clean out your lungs by providing moisture so you can productively cough up particles AND will help to clump together any particles floating around indoors and send them to the floor.
Higher humidity will even make the house feel warmer as humility helps transmit heat, actually saving you money on the power bill. Use them in both summer and winter to provide clean, pure moisture in your indoor environment. You'll find that you can drop the actual temperature several degrees (in winter) in your home after deploying these devices.
Just make sure to USE ONLY WARM WATER humidifiers. The one listed below started out as a coffee maker and became (pat) the BEST way to control humility indoors.
http://www.walmart.com/ip/Vicks-Warm-Mi ... r/29765912Automatically shuts down when empty so there is no hazard when away...
Grandma used to do this by simmering water on the stove...
...works for viruses and dust in most all forms.