Table 11.

Comparison of HI values in playgrounds for selected locations

Site	Cd	Cr	Cu	Ni	Pb	Zn
Madryd (De Miguel et al. 2007)	1 × 10−3	2.7 × 10−2	1.4 × 10−3	1.5 × 10−3	3 × 10−2	7.1 × 10−4
Spas in S Poland (Kicińska 2018)	6.3 × 10−3	1.4 × 10−2	3.4 × 10−4	9.6 × 10−4	5.2 × 10−3	4.0 × 10−4
Lublin (this work)	4.5 × 10−3	5.6 × 10−2	3 × 10−4	5 × 10−4	9.6 × 10−3	2 × 10−4