RT Journal Article
SR Electronic
T1 Oxygen Production by Urban Trees in the United States
JF Arboriculture & Urban Forestry (AUF)
FD International Society of Arboriculture
SP 220
OP 226
DO 10.48044/jauf.2007.026
VO 33
IS 3
A1 David J. Nowak
A1 Robert Hoehn
A1 Daniel E. Crane
YR 2007
UL http://auf.isa-arbor.com/content/33/3/220.abstract
AB 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. population. 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.