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Article Source: Effectiveness of Low Emission Zones: Large Scale Analysis of Changes in Environmental NO₂, NO and NO_x Concentrations in 17 German Cities
Morfeld P, Groneberg DA, Spallek MF (2014) Effectiveness of Low Emission Zones: Large Scale Analysis of Changes in Environmental NO₂, NO and NO_x Concentrations in 17 German Cities. PLOS ONE 9(8): e102999. https://doi.org/10.1371/journal.pone.0102999

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