Indoor and outdoor air pollutants concentrations at preschools in Melusi informal settlement, Pretoria, South Africa.

Toluene was strongly and significantly correlated with ethylbenzene ( r = 0.81, p = 0.02) and xylene ( r = 0.71, p = 0.05, borderline significance) (Table 3 ), while ethylbenzene exhibited a very strong and significant correlation with xylene ( r = 0.91, p < 0.001) (Table 3 ), suggesting shared emission sources, likely from household fuel combustion or solvent use [ 6 ].

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