Oxygen production by urban forests in various cities and its relative effect compared with the city population.
| Trees (×1,000) | Oxygen prod.z (t/year × 1,000) | Oxygen offsety | Per person offsetx | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| City | Total | SE | Net total | SE | Net w/d total | SE | Net no. of people (% pop) | Net w/d no. of people (% pop) | Net no./ha | Net w/d no./ha | Net no. of trees | Net w/d no. of trees |
| Atlanta, GA | 9,415 | 749 | 112 | 8 | 86 | 12 | 366,400 (88%) | 280,300 (67%) | 29 | 22 | 26 | 34 |
| Baltimore, MD | 2,627 | 570 | 39 | 5 | 25 | 4 | 127,700 (20%) | 82,500 (13%) | 29 | 19 | 21 | 32 |
| Boston, MA | 1,183 | 109 | 25 | 2 | 19 | 2 | 82,900 (14%) | 60,400 (10%) | 26 | 19 | 14 | 20 |
| Calgary, Alberta | 11,889 | 2,777 | 52 | 7 | 45 | 6 | 169,000 (19%) | 147,700 (17%) | 33 | 28 | 70 | 81 |
| Freehold, NJ | 48 | 6 | 1 | 0 | 1 | 0 | 4,300 (39%) | 2,800 (25%) | 25 | 16 | 11 | 17 |
| Jersey City, NJ | 136 | 22 | 2 | 0 | 2 | 0 | 7,000 (3%) | 5,100 (2%) | 16 | 11 | 19 | 27 |
| Minneapolis, MN | 979 | 165 | 22 | 3 | 11 | 6 | 70,200(18%) | 36,200 (9%) | 18 | 9 | 14 | 27 |
| Moorestown, NJ | 583 | 53 | 9 | 1 | 7 | 1 | 29,700(160%) | 22,300(120%) | 28 | 21 | 20 | 26 |
| Morgantown, WV | 658 | 79 | 7 | 1 | 5 | 1 | 22,800 (85%) | 17,800 (66%) | 29 | 22 | 29 | 37 |
| New York, NY | 5,212 | 719 | 102 | 11 | 55 | 12 | 333,600 (4%) | 180,500(2%) | 20 | 11 | 16 | 29 |
| Philadelphia, PA | 2,113 | 211 | 39 | 4 | 29 | 4 | 127,200 (8%) | 93,000 (6%) | 24 | 17 | 17 | 23 |
| San Francisco, CA | 668 | 98 | 12 | 2 | 11 | 1 | 40,200 (5%) | 36,900 (5%) | 28 | 26 | 17 | 18 |
| Syracuse, NY | 876 | 119 | 13 | 1 | 11 | 1 | 42,800 (29%) | 37,200 (25%) | 29 | 25 | 20 | 24 |
| Toronto, Ontario | 7,542 | 889 | 98 | 10 | 76 | 10 | 318,300(13%) | 246,500 (10%) | 25 | 19 | 24 | 31 |
| Washington, DC | 1,928 | 224 | 39 | 4 | 31 | 3 | 127,400 (22%) | 101,400(18%) | 28 | 22 | 15 | 19 |
| Woodbridge, NJ | 986 | 97 | 13 | 1 | 10 | 1 | 43,900 (44%) | 32,000 (32%) | 25 | 18 | 22 | 31 |
↵zAnnual oxygen production by the urban forest (thousands of metric tons per year). Multiply by 1.102 to convert to tons.
↵yNumber of people and percent of city population that urban forest oxygen production offsets in terms of average adult human oxygen consumption per year.
↵xAverage number of people whose oxygen consumption is offset by oxygen production per hectare of tree cover in the city (no./ha; divide by 2.471 to convert to no./ac) and average number of trees needed in city to offset the oxygen consumption of one adult human (no. of trees).
Net = net oxygen production of population without consideration of decomposition; Net w/d = net oxygen production of population considering decomposition; net production minus estimated oxygen consumed resulting from decomposition; SE = standard error.