Core Activities

Benefit of Urban Trees

Air Quality - Carbon Sequestering/Oxygen Production (back)

A typical person consumes about 386 lb. of oxygen per year. A healthy tree, say a 32 ft tall ash tree, can produce about 250 lb. of oxygen annually – two trees supply the oxygen needs of a person each year! Cooler air temperatures created by tree canopies reduce smog levels by up to 6%. Finally, a mature tree absorbs from 120 to 240 lbs. of the small particles and gases of air pollution.

You need about 500 full-sized trees to absorb the carbon dioxide produced by a typical car driven 20,000 km/year

A fast growing species like Silver Maple (Acer saccharinum) can absorb up to 4 kg of carbon dioxide per year.

1 acre (approx. 78 trees) provides enough oxygen for 18 people.

Filtering Impurities from the Air (back)

Streets with trees can contain between 1000-3000 dust particles/liter of air; streets without trees can contain between 10000-12000 particles/liter of air.

Improved Water Quality by Reducing Runoff (back)

Trees intercept rainfall and reduce run-off, thereby functioning like retention/detention basins.

The canopy of a street tree absorbs rain, reducing the amount of water that will fall on pavement and then must be removed by a storm water drainage system. 32 feet tall street trees intercepted rainfall, reducing storm water runoff by 327 gallons.

Energy Reduction (heating and air-conditioning) (back)

A 25 foot tree reduces annual heating and cooling costs of a typical residence by 8 to 12 percent. A mature tree canopy reduces air temperatures by about 5 to 10 degrees F, influencing the internal temperatures of nearby buildings.

On a hot summer day, a 60-year old maple can transpire about 4000 kg of water, the equivalent cooling effect of 6 room-size air conditioners.

Trees shading a home can reduce inside air temperatures by as much as 10 degrees Celsius.

Wildlife Habitat (back)

Trees provide habitat, food, and shelter for many birds and animals.

Aesthetic Improvement (back)

Trees have a beautiful way of framing the landscape. They provide shade, colour, and interesting shapes that model scenic vistas. They also, add “curb appeal” and a feeling of establishment to residential homes.

Increasing Property Values (back)

The market value of a home with trees on the lot can be as much as 20% higher than similar properties without trees.

Wind and Noise Screens (back)

Windbreaks can reduce air speeds by 4-22%, having an effect on site temperatures.

Vegetation generates noise of its own – birdsong and rustling leaves help to mask undesirable sounds.

Psychological Betterment (back)

The psychological impact of trees on people’s moods, emotions and enjoyment of their surroundings may in fact be one of the greatest benefits urban forests provide.

Studies show that hospital patients with window view of trees recovered significantly faster and with fewer complications than comparable patients without access to such views.