Even if you haven’t been cleaning up after irresponsible renters, when you or your visitors walk inside your home wearing outdoor shoes, you may track in a host of unhealthy substances without even knowing it:
Herbicides and pesticides from neighboring lawns
Antifreeze, tire rubber, hydrocarbons, and even lead from nearby streets
Lead dust and asbestos particles (from remodeling), concrete dust and drywall dust from construction sites
Animal (and sometimes human) urine, feces, and dander, and dead bugs from sidewalks, lawns, and alleys
Overflowed-toilet water and urine from public restrooms
Gasoline, antifreeze, motor oil, and spilled beverages from gas stations
Blue Planet: Go Shoeless Indoors for A Healthier Home
