Very small particles are of particular importance as these can be readily inhaled. ![]() ![]() Some particles are large enough to be seen with the naked eye while others are microscopic. Particulate matter (PM) is defined as the combination of solid particles and liquid droplets found in the air. ![]() This project uses a Honeywell HPM series particle sensor to measure and display 2.5 µm PM and 10.0 µm PM concentrations of particulate matter in the air of your environment.
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