Secondary formation

{
  "id": "MLC-T-ENV-025004",
  "term": "Secondary formation",
  "field": "Environment",
  "term_source": "Secondary Formation",
  "definition": "1. The process by which chemicals are transformed in the air into other chemicals. When a chemical is transformed, the original HAP no longer exists; it is replaced by one or more chemicals. Compared to the original chemical, the newer reaction products can have more, less, or the same toxicity. Transformations and removal processes affect both the fate of the chemical and its atmospheric persistence. Persistence is important because human exposure to chemical is influenced by the length of time the chemical remains in the atmosphere. Note that in NATA the terms atmospheric transformation and secondary formation are used interchangeably.\n\n2. The process by which chemicals are transformed into other chemicals in the air (atmosphere). When a chemical is transformed the original pollutant no longer exists; it is replaced by one or more new chemicals. Compared to the original chemical, the transformed chemical(s) can have more, less or the same toxicity.In NATA, we use both “atmospheric transformation” and “secondary formation;” they mean the same thing.",
  "subject": "Environmental events",
  "see_also": [
    "Atmospheric Transformation (secondary formation)"
  ],
  "references": [
    "National Air Toxics Assessment (NATA) Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/secondary-formation/"
}