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    Author(s): David J. NowakRobert HoehnDaniel E. Crane
    Date: 2007
    Source: Arboriculture & Urban Forestry. 33(3): 220-226.
    Publication Series: Scientific Journal (JRNL)
    Station: Northern Research Station
    PDF: Download Publication  (98.25 KB)


    Urban forests in the coterminous United States are estimated to produce ≈61 million metric tons (67 million tons) of oxygen annually, enough oxygen to offset the annual oxygen consumption of approximately two-thirds of the U.S. opulation. Although oxygen production is often cited as a significant benefit of trees, this benefit is relatively insignificant and of negligible value as a result of the large oxygen content of the atmosphere. Other benefits of the urban forest are more critical to environmental quality and human health than oxygen production by urban trees.

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    Nowak, David J.; Hoehn, Robert; Crane, Daniel E. 2007. Oxygen production by urban trees in the United States. Arboriculture & Urban Forestry. 33(3): 220-226.


    air quality, environmental quality, tree benefits, urban forests

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