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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

Table 2. Average air-pollution reduction (NO2 and PM2.5) for all ground-level monitoring stations as well as urban-background stations separately (in parentheses) for the entire year 2020 as well as for two lockdown periods for the four cities.

City Period Dates Air Pollution Reduction (%)
NO2 (Urban Background) PM2.5 (Urban Background)
Greater London Year 13 January–30 December –42% (–38%) –31% (–28%)
First lockdown 23 March–10 May –47% (–39%) –13% (–8%)
Second lockdown 5 November–2 December –35% (–29%) 0% (0%)
Cardiff Year 13 January–30 December –32% (–41%) –35% (–30%)
First lockdown 23 March–10 May –36% (–50%) –5% (–4%)
Second lockdown 23 October–9 November –43% (–53%) –10% (–10%)
Edinburgh Year 13 January–30 December –27% (–49%) –42% (–42%)
First lockdown 23 March–10 May –54% (–53%) –35% (–37%)
Second lockdown 20 November–11 December –18% (–38%) –24% (–24%)
Belfast Year 13 January–30 December –23% (–24%) –33% (–33%)
First lockdown 23 March–10 May –43% (–35%) –33% (–32%)
Second lockdown 27 November–11 December –23% (–21%) –14% (–14%)