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. 2020 Jul 14;17(14):5067. doi: 10.3390/ijerph17145067

Figure 3.

Figure 3

NO2 concentration profiles during March 2020 (Orange) compared to average and standard deviation of March concentrations over the previous 5 years (Blue) for the four studied cities (most significant COVID-19 intervention date indicated with colored dot). All available station data used for each city (see Section 2.2).