August 3, 2025Open Access

NOx emissions changes from 2019 to 2021 in Eastern China as estimated through variational inversions and TROPOMI satellite data

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Analysis reveals NOx emissions decreased during COVID-19 in Eastern China, suggesting impacts of national events.

Core finding shows a nearly 40% reduction in NOx emissions in February 2020 compared to 2019 due to COVID-19 lockdowns.
TROPOMI satellite data were used for high-resolution NOx emissions assessments in Eastern China, enhancing accuracy.
Annual NOx emissions decreased by 0.2 TgNO2/year in 2020, while an increase of 4% was observed in 2021 versus 2019.
The research allows for evaluation of regional policy impacts by providing provincial-level emissions data.

Abeed et al. (2025) studied this question.

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