Modeled PM2.5 removal by trees in ten U.S. cities and associated health effects(Abstract, David J. Nowaka, Satoshi Hirabayashib, Allison Bodineb, Robert Hoehna, Environmental Pollution, July 2013)
Also discussed here: Urban Trees Remove Fine Particulate Air Pollution, Save Lives(Science Daily, Jun. 19, 2013)
Today we review research into the amount of fine particulate matter [PM 2.5] removed from the air by urban trees and what this means in terms of economic benefit from human health cost savings. Results from 10 US cities indicate that trees improved air quality by 0.05 to0.24% which appears small but when applied to a city as large as New York translates into 7.6 premature deaths avoided or delayed and over $60 M saved.
Centre ville d'Atlanta, Géorgie, Etats-Unis (Photo credit: Wikipedia)
"This research clearly illustrates that America's urban forests are critical capital investments helping produce clear air and water; reduce energy costs; and, making cities more livable. Simply put, our urban forests improve people's lives."
“estimated how much fine particulate matter is removed by trees in 10 cities, their impact on PM2.5 concentrations and associated values and impacts on human health”
"Trees can make cities healthier…While we need more research to generate better estimates, this study suggests that trees are an effective tool in reducing air pollution and creating healthier urban environments."
“Mortality reductions were typically around 1 person yr−1 per city, but were as high as 7.6 people yr−1 in New York City. Average annual percent air quality improvement ranged between 0.05% in San Francisco and 0.24% in Atlanta”
“The total amount of PM2.5 removed annually by trees varied from 4.7 metric tons in Syracuse to 64.5 metric tons in Atlanta, with annual values varying from $1.1 million in Syracuse to $60.1 million in New York City. Most of these values were dominated by the effects of reducing human mortality; the average value per reduced death was $7.8 million”
“Reduction in human mortality ranged from one person per 365,000 people in Atlanta to one person per 1.35 million people in San Francisco.”