Removing or reducing the source of contamination is the most effective way to improve indoor air quality. This itself seems like a never-ending process, but we are chipping away at it. We have tossed all of the toxic cleaning products, baby and kid products, and are now working on personal hygiene and beauty products.
Another big one is controlling humidity levels in our home. This can be harder than it seems: you don't want too much humidity to avoid the growth of mold, but too little humidity can leave you with dry, irritated skin, dries the throat and airways, and, in our family's’ case, causes bloody noses.
For our home, we ended up having to get both a dehumidifier and a humidifier. The crawl space/storage room under our garage gets very humid, so we got this Ecohouzng dehumidifier, which continually runs down there.
But upstairs, where our bedrooms are, gets very dry during the winter. We are dealing with dry skin, eczema, snoring, bloody noses, and frequent coughing. So, we have two Dyson humidifiers in our rooms upstairs. We love the Dyson one because you have the option to put it on auto so it will monitor the humidity in the room and adjust its output accordingly.