Air pollution

{
  "id": "MLC-T-CHM-000352",
  "term": "Air pollution",
  "field": "Chemistry",
  "definition": "The presence of harmful or undesirable substances in the Earth's atmosphere, resulting from natural processes or human activities, that can adversely affect human health, ecosystems, and materials. This phenomenon involves the release of gases, particulate matter, and biological molecules into the air. Major sources include industrial emissions, vehicle exhaust, and agricultural practices.",
  "subject": "Chemistry and the Environment",
  "references": [
    "PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2172 (https://doi.org/10.1351/pac199062112167)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/air-pollution/"
}