Air cleaners: make your rooms colloid-free!
Have you heard of colloids? These are tiny (very tiny in fact!) particles in the air that cannot be seen by the naked eye. Though some can be seen by turning on a flashlight (you can see little particles floating in the air), millions of it are microscopic and can only be seen using special tools. These colloids pose a problem to the asthmatics and those who are allergic to dust since they can be found everywhere.
What you can do is to obtain air cleaners in every room to make sure that your room is colloid free. It can filter the air, thus, those tiny particles (some are hazardous, believe me!) will be gone forever! Don’t forget to change the filter on a regular basis!
Photo taken from http://www.appliancist.com