Particulate Matter by Size

{
  "id": "MLC-T-ENV-020312",
  "term": "Particulate Matter by Size",
  "field": "Environment",
  "definition": "X refers to the diameter at which the sampler collects 50% of the particles and rejects 50% of the particles. Collection efficiency increases for particles with smaller diameters and decreases for particles with larger diameters. The variation of collection efficiency with size is given by a collection efficiency curve. The definition of PMx is frequently abbreviated as “particles with a nominal mean aerodynamic diameter less than or equal to x μm.",
  "abbreviation": "PMx",
  "references": [
    "EPA Integrated Science Assessment for Particulate Matter EPA/600/R-08/139F"
  ],
  "url": "https://mlchart.com/terminology/environment/particulate-matter-by-size/"
}