Table 4.5
Air pollutant removal services by urban trees in selected population centres, 2010
| Population centre | Area | Tree cover | Estimated removal of pollution | Average pollution removal per unit of tree cover | Population, 2011 | Estimated monetary value associated with various health effects due to pollutant reduction from trees |
|---|---|---|---|---|---|---|
| km2 | percentage | tonnes | g/m2 | number | dollars/hectare | |
| Calgary | 722.8 | 9.3 | 203.3 | 3.0 | 1,095,404 | 1,074 |
| Edmonton | 872.6 | 13.0 | 304.6 | 2.7 | 960,015 | 1,206 |
| Ottawa-Gatineau (Que.) | 172.3 | 30.6 | 183.5 | 3.5 | 236,329 | 547 |
| Halifax | 291.4 | 51.8 | 547.0 | 3.6 | 297,943 | 547 |
| Hamilton | 394.8 | 21.6 | 458.7 | 5.4 | 670,580 | 1,016 |
| Kitchener | 319.4 | 20.5 | 300.7 | 4.6 | 444,681 | 1,564 |
| London | 225.7 | 20.3 | 199.0 | 4.3 | 366,191 | 804 |
| Montréal | 1,557.6 | 22.7 | 1,400.3 | 4.0 | 3,407,963 | 886 |
| Ottawa-Gatineau (Ont.) | 389.4 | 26.5 | 366.1 | 3.6 | 697,267 | 484 |
| Québec | 682.9 | 47.0 | 686.1 | 2.1 | 696,946 | 275 |
| St. Catharines – Niagara | 394.4 | 23.9 | 491.9 | 5.2 | 309,319 | 471 |
| Toronto | 1,763.4 | 18.2 | 1,472.2 | 4.6 | 5,132,794 | 792 |
| Vancouver | 1,206.6 | 40.0 | 1,744.6 | 3.6 | 2,135,201 | 336 |
| Victoria | 281.6 | 45.5 | 450.1 | 3.5 | 316,327 | 334 |
| Winnipeg | 460.1 | 16.5 | 244.6 | 3.2 | 671,551 | 938 |
| Other population centres | 6,578.8 | 30.2 | 7,467.6 | 3.8 | 5,564,040 | 371 |
|
Notes: This study covers 85 medium and large urban population centres (i.e. those with a population greater than 30,000). Population and area are reported for population centres as reported in the 2011 Census of Population. Ottawa-Gatineau has been split at the provincial boundary. The estimated monetary values associated with health effects due to pollutant reduction in Ottawa and Gatineau have been revised from the original article to adjust for the actual population in 2011. Sources: Nowak, D., et al., 2018, “Air pollution removal by urban forests in Canada and its effect on air quality and human health,” Urban Forestry and Urban Greening, Vol. 29, pp. 40-48, https://doi.org/10.1016/j.ufug.2017.10.019 (accessed March 4, 2020); Statistics Canada, 2012, 2011 Census Profiles, Catalogue no. 98-316-XWE, http://www12.statcan.gc.ca/census-recensement/2011/dp-pd/prof/index.cfm?Lang=E (accessed July 6, 2020); Statistics Canada, Boundary Files, 2011 Census, https://www12.statcan.gc.ca/census-recensement/2011/geo/bound-limit/bound-limit-2011-eng.cfm (accessed July 6, 2020); Pasher, J., et al., 2014, “Assessing carbon storage and sequestration by Canada's urban forests using high resolution earth observation data,” Urban Forestry and Urban Greening, Vol. 13, no. 3, p. 484-494, https://doi.org/10.1016/j.ufug.2014.05.001 (accessed June 15, 2015). |
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