Odd hydrogen

{
  "id": "MLC-T-MET-007669",
  "term": "Odd hydrogen",
  "field": "Meteorology and atmospheric science",
  "definition": "A family of highly reactive, short-lived chemical species in the atmosphere containing an odd number of hydrogen atoms, primarily the hydroxyl radical (OH) and the hydroperoxyl radical (HO2). These radicals are central to atmospheric chemistry, initiating the oxidation of many trace gases and controlling the concentration of pollutants like ozone and methane. Odd hydrogen species are produced photochemically, with their concentrations peaking during daylight hours in the troposphere and stratosphere.",
  "url": "https://mlchart.com/terminology/meteorology/odd-hydrogen/"
}