A lot of people buy a purifier for a damp room, or a dehumidifier for a dust problem. Four quick questions sort it out, with the free things to try first.
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Pick one if it applies.
DampOrDust is a general educational decision aid. It is not a home inspection, a safety assessment, a medical diagnosis or building advice. Suggestions are based only on the answers you pick and can't detect hidden water damage, hazards or every possible cause. Don't rely on it to decide whether a home is safe: get qualified help for persistent damp, recurring mould, suspected gas or combustion problems, or health symptoms.
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