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. Author manuscript; available in PMC: 2021 Oct 25.
Published in final edited form as: Build Cities. 2021 Sep 2;2(1):759–778. doi: 10.5334/bc.124

Figure 4. Comparison between the yearly average concentration of NO2 for all stations for each city during the two lockdown periods and the previous 10 years.

Figure 4

Note: Dashed lines show the 10-year averages (2010–19); and broken lines show the five-year mean (trend for Greater London).