According to a study by the University of Arizona, 60% of household dust comes from outside, primarily brought into the home from the bottom of shoes, with these contaminants including arsenic, lead and DDT.
It is almost unbelievable all the things over which your shoe’s are trampling. Leaving them by the door helps your health (not to mention, your kid’s and pet’s health who may be on that floor) and the cleanliness of your home… AND it is easy to do.