Percentage of de-icing salt class per street width and distance from trunk to curb class.
| De-icing salts (mg/kg and oz/lb of Na) | ||||||
|---|---|---|---|---|---|---|
| 0–250z (0.0–0.0040) | 251–500 (0.00401–0.00801) | 501–750 (0.00802–0.01202) | 751–1000 (0.01203–0.01603) | 1001–1758 (0.01604–0.02819) | ||
| Street width (m / ft) | 8.9–10.9 (29.2–35.8) | 87.1% | 9.6% | 2.9% | 0.4% | 0.0% |
| 11.0–14.2 (36.0–46.6) | 75.4% | 15.6% | 5.7% | 1.6% | 1.6% | |
| Distance trunk to curb (m / ft) | 0.45–1.0 (1.48–3.28) | 78.3% | 14.1% | 5.1% | 1.3% | 1.2% |
| 1.01–2.0 (3.31–6.56) | 89.1% | 8.7% | 2.2% | 0.0% | 0.0% | |
↵z According to Hootman et al. (1994), 250 mg/kg is the threshold to be considered as excessive for most trees.