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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