Particulate Matter 2.5

{
  "id": "MLC-T-ENV-020309",
  "term": "Particulate Matter 2.5",
  "field": "Environment",
  "definition": "1. PM-2.5 or PM2.5 refers to smaller particles in the air (i.e., less than or equal to 2.5 micrometers in diameter).\n\n2. Particulate matter with an aerodynamic diameter less than or equal to a nominal 2.5 micrometers as measured by a reference method based on appendix L of part 50 of this chapter and designated in accordance with part 53 of this chapter, by an equivalent method designated in accordance with part 53 of this chapter, or by an approved regional method designated in accordance with appendix C to this part.[40 CFR 53.1 (CFR 2013)]\n\n3. Particulate matter with an aerodynamic diameter less than or equal to 2.5 micrometers.\n\n4. The environmental burden indicator for PM2.5 measures the potential exposure to inhalable particles 2.5 microns or smaller (about 30 times smaller than the width of human hair) in terms of annual average concentration in micrograms per cubic meter (µg/m³). EJScreen presents PM2.5 concentrations using percentile rank, ranging from 0 (lowest) to 100 (highest). This indicator does not designate compliance with the national ambient air quality standard for PM2.5.\n\n5. For more details on the PM2.5 indicator, including why it is important and what you can do moving forward, please visit the EJScreen Indicator Overview for PM2.5 (https://www.epa.gov/ejscreen/ejscreen-indicator-overviews-particulate-matter-25-pm25).",
  "abbreviation": "PM 2.5",
  "synonyms": [
    "PM2.5"
  ],
  "subject": "General environmental",
  "references": [
    "Improving Air Quality in Your Community",
    "40 CFR 58.1 (CFR 2013)",
    "40 CFR 49.123 (CFR 2013)",
    "EPA Office of Air and Radiation",
    "Glossary of EJSCREEN Terms"
  ],
  "url": "https://mlchart.com/terminology/environment/particulate-matter-2-5/"
}