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Effectiveness of Low Emission Zones: Large Scale Analysis of Changes in Environmental NO₂, NO and NO_x Concentrations in 17 German Cities

Table 5

NO₂: Quadruplets of pooled continuous and diffuse sampler NO₂-measurements: index stations (Ind), reference stations (Ref) before (pre) and after (post) introduction of LEZ.

doi: https://doi.org/10.1371/journal.pone.0102999.t005