Trees clean the air:
Trees help cleanse the air by intercepting airborne particles, reducing heat, and absorbing such pollutants as carbon monoxide, sulfur dioxide, and nitrogen dioxide. Trees remove this air pollution by lowering air temperature, through respiration, and by retaining particulates.
A Tree's Importance and Environmental Benefit
By Steve Nix, About.com Guide
Eight Reasons to Plant Trees | Trees Clean the Air
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