Nature research paper: Variation in ground-level nitrogen dioxide pollution during COVID-19 lockdowns
in 2020 to 2019 was calculated for each country and each month from January to June. The 2020/2019 NOratio in countries with the strictest lockdown was 29 ± 3% lower than for countries with the weakest lockdowns . Maximum and median ratios were also lower for countries with strict lockdowns. Both distributions have similar variability which demonstrates similar interannual variability due to meteorology for both sets.
Observed NOchanges at these power plants exceed expected changes from meteorology alone . Although variability between power plants reflects a mix of regionally varying factors, including meteorology, electricity demand, fuel type and plant-specific emission controls, as well as changes in nearby emissions from other sectors including transportation, these differences indicate a sensitivity of local air quality to activity restrictions affecting the energy sector.
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