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Set up your sensor, connect your home, and make sense of your air.
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Basements run cooler, more humid, and lower-ventilated than the floors above. The HVAC lives down there, the water heater lives down there, and so do the paint cans, the radon, and most of the mold problems.
In a multi-unit building, your air is your neighbors' air. Cooking, smoking, cleaning chemicals, even fragrances migrate through shared HVAC, plumbing chases, and balcony paths. Here is how that happens and what can actually be done from inside one unit.
A tight 2020 build and a leaky 1925 farmhouse fail in opposite directions. The dashboard signatures are different, the priorities are different, and "better" depends on what you are trying to solve.
Your clothes shed plastic. So does your carpet, your bedding, and your packaging. The dashboard's PM channels see the bigger fragments as a subset of total particles; the science on health impact is still arriving.
PFAS exposure indoors is dominated by dust ingestion and dermal contact, not by inhalation. The SEN66 cannot detect them; reducing PFAS load is a housekeeping and procurement problem, not a sensor problem.
You spend a third of your life within a foot of a polyurethane foam slab. The "new mattress smell" is a measurable VOC emission curve, and it lasts longer than the marketing suggests.
A neglected ultrasonic humidifier aerosolizes whatever is in its reservoir, including bacteria. This is the one IAQ device where maintenance is a life-safety issue, not a comfort one.
The blanket "carpet is always bad for IAQ" rule does not survive contact with the data. Quality, age, maintenance, and what is under the floor matter more than the category.
Hobby 3D printing emits ultrafine particles and VOCs that scale with filament chemistry and bed temperature. The dashboard sees it; here is what is happening and how to print without exposure.
Sawdust from oak and walnut is an IARC Group 1 carcinogen for occupational woodworkers. The hobby shop in your garage deserves the same controls; the dashboard will tell you whether they are working.
Light-industrial spaces need pattern visibility around dust, combustion, solvents, ventilation, and maintenance. IAQ monitors support triage; they do not replace occupational hygiene instruments.
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