It depends what you are doing at the time. Particulate sensors will pick up water vapour, smells from cooking and some types of dust. Is there pollen outside? That can make the outdoor count higher.
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I used the Dylos DC1700-PM particulate sensor for a while. I was surprised how much it picked up water vapour, and how much it didn't pick up wood smoke when I was smelling it http://www.dylosproducts.com/dcpmaqm.html
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