Precursor pollutants

{
  "id": "MLC-T-ENV-021900",
  "term": "Precursor pollutants",
  "field": "Environment",
  "term_source": "Precursor Pollutants",
  "definition": "Are: 1.)For ozone, nitrogen oxides (NOx), unless an area is exempted from NOx requirements under section 182(f) of the Act, and volatile organic compounds (VOC). 2.)For PM-10, those pollutants described in the PM-10 nonattainment area applicable SIP as significant contributors to the PM-10 levels. 3.)For PM₂ׅ₅: (i) Sulfur dioxide (SO2) in all PM2.5 nonattainment and maintenance areas, (ii) Nitrogen oxides in all PM2.5 nonattainment and maintenance areas unless both the State and EPA determine that it is not a significant precursor, and (iii) Volatile organic compounds (VOC) and ammonia (NH3) only in PM2.5 nonattainment or maintenance areas where either the State or EPA determines that they are significant precursors.",
  "subject": "Air",
  "references": [
    "General Conformity Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/precursor-pollutants/"
}