Jul 26, 2014 11:47 AM EDT By J Baulkman, UniversityHerald Reporter

Trees are effectively saving lives and reducing respiratory problems, according to a recent study.

Researchers found that trees are saving more than 850 human lives a year and preventing 670,000 incidences of acute respiratory symptoms. While trees' pollution removal equated to an average air quality improvement of less than 1 percent, the impacts of that improvement are substantial. Researchers valued the human health effects of the reduced air pollution at nearly $7 billion every year.

The study is the first broad-scale estimate of air pollution removal by trees nationwide.

"With more than 80 percent of Americans living in urban area, this research underscores how truly essential urban forests are to people across the nation," Michael T. Rains, director of the Forest Service's Northern Research Station and the Forest Products Laboratory, said in a statement. "Information and tools developed by Forest Service research are contributing to communities valuing and managing the 138 million acres of trees and forests that grace the nation's cities, towns and communities."

The research team said trees' benefits vary with tree cover across the nation. Tree cover in the United States is estimated at 34.2 percent but varies from 2.6 percent in North Dakota to 88.9 percent in New Hampshire.

"In terms of impacts on human health, trees in urban areas are substantially more important than rural trees due to their proximity to people," Dave Nowak of the U.S. Forest Service's Northern Research Station said in a statement. "We found that in general, the greater the tree cover, the greater the pollution removal, and the greater the removal and population density, the greater the value of human health benefits."

The findings were recently published in the journal Environmental Pollution.

The study considered four pollutants for which the U.S. EPA has established air quality standards: nitrogen dioxide, ozone, sulfur dioxide, and particulate matter less than 2.5 microns (PM2.5) in aerodynamic diameter. Health effects related to air pollution include impacts on pulmonary, cardiac, vascular, and neurological systems. In the United States, approximately 130,000 PM2.5-related deaths and 4,700 ozone-related deaths in 2005 were attributed to air pollution.

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