Particles per cubic meter was a measurement of density that defined the amount of particles found in a cubic meter.

During a sensor sweep of the Romulan Neutral Zone in 2372, the USS Enterprise-E found 25 particles of dust per cubic meter. (Star Trek: First Contact)

For the Paris Radiogenic Sweepstakes, which was organized by Tom Paris aboard the USS Voyager in 2372, the radiogenic particle density result of the first day was reported at the measured coordinates to be 1873 per cubic meter. On the second day, the ship's computer reported that the particle density at the measured coordinates were measured at 1415 per cubic meter. (VOY: "Meld")

To recreate B'Elanna Torres' near-death experience in sickbay, The Doctor placed an isolation field around her while she was in the surgical bay. He then decreased the oxygen concentration within the force field by 27 percent before he began ionizing the enclosed atmosphere to 5000 particles per cubic meter. VOY: "Barge of the Dead")

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