Correction to: Environmental Science and Pollution Research (2019) 26:16998–17009
10.1007/s11356-019-04781-3
All measurements in the paper are to be understood as expressed in mg/m3, it means that in Table 2, Fig. 1, Table 6 and two instances in the results sections in paragraph 3 (when citing the NO2 concentration) all "ppb" concentrations should have been instead labelled as “mg/m3”.
Footnotes
The online version of the original article can be found at 10.1007/s11356-019-04781-3