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- W3201322597 abstract "An analysis of the air quality over the Po valley has been performed by using both satellite and in situ observations of NO<sub>2</sub> for the COVID-19 years, 2019-2021. To match satellite observations to those in situ, we have used a geostatistical re-gridding technique. The tools allow us to scale the satellite NO<sub>2</sub> retrievals to a finer spatial resolution, which helps us to perform a better spatial colocation with in situ observations. The satellite data consist of Level 2 (L2) NO<sub>2</sub> retrievals from TROPOMI (the TROPOspheric Monitoring Instrument), whereas in situ observtaions are taken at eleven diverse stations, which are spread over the Po valley. The Po Valley, in the winter 2019/20, has been the first region in Europe to be severely hit by the COVID-19 pandemic. The Italian government introduced severe restriction measures from March to May 2020 (lockdown). We compared TROPOMI NO<sub>2</sub> concentration during winters 2018-19 (no-COVID-19) and the following 2 winters. The observations of TROPOMI, in agreement with the in-situ measurements, saw a significant decrease in the NO<sub>2</sub> concentration in March 2020 after the introduction of the lockdown. But they also found a general decrease in lower tropospheric NO<sub>2</sub> in winter 2019/2020, the warmest winter ever observed that has limited the use of power for residential and commercial heating. NO<sub>2</sub> concentrations raise almost to the pre-COVID-19 values in the 2020/21 winter." @default.
- W3201322597 created "2021-09-27" @default.
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- W3201322597 date "2021-09-12" @default.
- W3201322597 modified "2023-09-27" @default.
- W3201322597 title "Assessment of air quality with TROPOMI during COVID-19 pandemic: NO2 over the Po valley" @default.
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- W3201322597 doi "https://doi.org/10.1117/12.2599774" @default.
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