NOx emissions reduction and rebound in China due to the COVID-19 crisis
Ding, J., van der A, R., Eskes, H.,
Mijling, B., Stavrakou, R., van Geffen, J. and Veefkind, P.: 2020,
Geophys. Res. Lett. 47, 9 pp.
Abstract
During the COVID19 lockdown (24 January-20 March) in China low air pollution
levels were reported in the media as a consequence of reduced economic and
social activities. Quantification of the pollution reduction is not
straightforward due to effects of transport, meteorology, and chemistry. We
have analyzed the NOx emission reductions calculated with an inverse
algorithm applied to daily NO2 observations from TROPOMI onboard the
Copernicus Sentinel-5P satellite. This method allows the quantification of
emission reductions per city and the analysis of emissions of maritime
transport and of the energy sector separately. The reductions we found are
20-50% for cities, about 40% for power plants, and 15-40% for maritime
transport depending on the region. The reduction in both emissions and
concentrations shows a similar timeline consisting of a sharp reduction
(34-50%) around the Spring festival and a slow recovery from mid-February to
mid-March.
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created: 29 September 2020
last modified: 29 September 2020