Widely available sensors, such as those used for optical computer mice, can be repurposed to perform particulate matter (PM) sensing. Such sensing arrangements may be incorporated as part of a smart home device or, more generally, a computerized device without needing a fan to provide air circulation and yet can still provide reasonably accurate PM sensing.
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Madrid, Jose, "SENSING AIR PARTICULATE MATTER USING AN OPTICAL MOUSE SENSOR", Technical Disclosure Commons, (June 09, 2021)