Assessment of air quality with TROPOMI during COVID-19 pandemic: NO2 over the Po valley

Guido Masiello; Angela Cersosimo; Francesco Falabella; Pietro Mastro; Pamela Pasquariello; Carmine Serio; Sara Venafra

doi:10.1117/12.2599774

12 September 2021 Assessment of air quality with TROPOMI during COVID-19 pandemic: NO₂ over the Po valley

Guido Masiello, Angela Cersosimo, Francesco Falabella, Pietro Mastro, Pamela Pasquariello, Carmine Serio, Sara Venafra

Proceedings Volume 11859, Remote Sensing of Clouds and the Atmosphere XXVI; 1185903 (2021) https://doi.org/10.1117/12.2599774
Event: SPIE Remote Sensing, 2021, Online Only

Abstract

An analysis of the air quality over the Po valley has been performed by using both satellite and in situ observations of NO₂ 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 NO₂ 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) NO₂ 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 NO₂ 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 NO₂ concentration in March 2020 after the introduction of the lockdown. But they also found a general decrease in lower tropospheric NO₂ in winter 2019/2020, the warmest winter ever observed that has limited the use of power for residential and commercial heating. NO₂ concentrations raise almost to the pre-COVID-19 values in the 2020/21 winter.

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Guido Masiello, Angela Cersosimo, Francesco Falabella, Pietro Mastro, Pamela Pasquariello, Carmine Serio, and Sara Venafra "Assessment of air quality with TROPOMI during COVID-19 pandemic: NO₂ over the Po valley", Proc. SPIE 11859, Remote Sensing of Clouds and the Atmosphere XXVI, 1185903 (12 September 2021); https://doi.org/10.1117/12.2599774

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