I always shake my shoes well before putting them on - whether they are in closet or near door. When I taught school, I always had a lot of plants to help purify the air and I noticed we were a pretty healthy group.
i think taking off your shoes right inside the door is fine too. i kept saying that i wanted to do that when i moved into my current apartment, but i'm so used to just keeping my shoes on that i never got started.
i've been coughing quite a bit lately. guess it's time to vacuum?
Wikipedia has a list of plants for cleaning the air. Search on "List of air-filtering plants" The list has many plants that the Green Team at my office listed as air-filtering, plus others that they missed. Also toxicity of these plants. There are many other articles that you can get by searching - Wikipedia's was the most complete, and seemed not to want to sell me anything. Happy searching!
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