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The volatile organic compounds come from a variety of sources. A few of them are natural. Most of them are anthropogenic (come from the activities of humans).

  • decay of dead organic matter
  • organic gases released by plants as part of their metabolism including ethylene, α - pinene, limonene, β - pinene; mycene; ocimene; α - terpinene and isoprene
  • forest fires
  • fires from slash and burn agriculture
  • flatulence from animals
  • organic solvents used in manufacturing and in consumer goods
  • processing of petrochemicals
  • evaporation of organic fuels during fueling operations
  • photochemical reactions of some volatile organic chemicals transforming them into other volatile organic chemicals
  • generation during combustion of organic fuels such as coal, ethanol, diesel, and gasoline
  • spraying of volatile pesticides
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