authority: gcos
slug: precursors-for-aerosols-and-ozone
name: Precursors for Aerosols and Ozone
domain: atmosphere
subdomain: composition
authority_id: gcos:precursors-for-aerosols-and-ozone
external_ids:
  nvs_uri: null
  cf_standard_name: null
  iadopt_concepts:
    property: mole-fraction
    entity: precursor-gas
canonical_units: "1"
gcos_requirement_tier:
  threshold: null
  breakthrough: null
  goal: null
description: |
  Reactive precursor gases that control secondary aerosol and ozone
  formation: NO2, SO2, HCHO, CO, NH3 and volatile organic compounds.
  Measured by surface networks and UV/visible/IR satellite spectrometers.
theme: atmosphere
demos: []
status: documented
sources:
  - https://gcos.wmo.int/site/global-climate-observing-system-gcos/essential-climate-variables/precursors-for-aerosols-and-ozone