Larger tree canopies yield greater benefits. Cities can maximize the benefits of trees by selecting the largest canopy tree for the available planting space. The surface area of a tree’s leaves covers between 2 and 8 times the area directly covered by the tree. As a result, larger tree canopies result in improved air quality, cooler summer air, greater reduction of storm water, better water quality, and reduced demand for summertime peak electricity.
Air Quality100 trees remove 5 tons of CO 2 and 1,000 lbs of pollutants per year.
Water Quality and Runoff100 trees save $550 annually in storm water infrastructure costs.
Pavement LongevityShaded pavement can last 50% longer before needing resurfacing with slurry seal. This saves our communities $30,000 per mile in road resurfacing costs.
Parking LotsCars in shaded parking lots release 18%-21% less hydrocarbon emissions due to heat-induced leakage. Cabin temperatures are up to 60 degrees Fahrenheit lower.
From: E. Gregory McPherson, James R. Simpson, Paula J. Pepper, Qungfu Xiao, "Guidelines for San Joaquin Valley Communities", March 1999