9/12/2023 0 Comments Los angeles lockdown may 15![]() Large amounts of NO 2 are produced anthropogenically in the boundary layer by industrial processes, power generation, transportation, and biomass burning over polluted hotspots. Nitrogen dioxide (NO 2) is one of the most important and prominent air pollutants affecting human health and ecosystem. The slowdown and recovery in social and economic activities around the world usually introduce a temporal change of air pollution, particularly for air pollutants strongly related to transportation, industry, and energy. In an effort to prevent the wide and rapid spread of the novel severe virus, countries have imposed national or local restrictions, such as ordering to stay at home, banning on public gathering, and closing non-essential shops and services. The COVID-19 outbreak was announced as a pandemic in mid-March 2020 and has caused more than 90 million confirmed cases and more than 1.5 million deaths around the world as of January 2021 ( ). On 31 December 2019, an infectious pneumonia of unknown cause, subsequently named as coronavirus disease 2019 (COVID-19), was detected in Wuhan in China. ![]() Consistent NO 2 variations are observed for the GOME-2 measurements and the early afternoon TROPOMI data: regions with strong social responses to COVID-19 in Asia, Europe, North America, and South America show strong NO 2 reductions of ∼30–50% on average due to restriction of social and economic activities, followed by a gradual rebound with lifted restriction measures. We present the application of the GOME-2 data to analyze the lockdown-related NO 2 variations for morning conditions. The global GOME-2 and TROPOMI NO 2 datasets are generated at the German Aerospace Center (DLR) using harmonized retrieval algorithms potential influences of the long-term trend and seasonal cycle, as well as the short-term meteorological variation, are taken into account statistically. ![]() In this study, NO 2 variations over regions with strong responses to COVID-19 are analysed using datasets from the Global Ozone Monitoring Experiment-2 (GOME-2) sensor aboard the EUMETSAT Metop satellites and TROPOspheric Monitoring Instrument (TROPOMI) aboard the EU/ESA Sentinel-5 Precursor satellite. Countries around the world have enforced lockdown measures to prevent the spread of the virus, introducing a temporal change of air pollutants such as nitrogen dioxide (NO 2) that are strongly related to transportation, industry, and energy. Since its first confirmed case in December 2019, coronavirus disease 2019 (COVID-19) has become a worldwide pandemic with more than 90 million confirmed cases by January 2021.
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