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Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Sci+Adv 2021 ; 7 (24): ä Nephropedia Template TP
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Global tropospheric ozone responses to reduced NO (x) emissions linked to the COVID-19 worldwide lockdowns #MMPMID34108210
Miyazaki K; Bowman K; Sekiya T; Takigawa M; Neu JL; Sudo K; Osterman G; Eskes H
Sci Adv 2021[Jun]; 7 (24): ä PMID34108210show ga
Efforts to stem the transmission of coronavirus disease 2019 (COVID-19) led to rapid, global ancillary reductions in air pollutant emissions. Here, we quantify the impact on tropospheric ozone using a multiconstituent chemical data assimilation system. Anthropogenic NO (x) emissions dropped by at least 15% globally and 18 to 25% regionally in April and May 2020, which decreased free tropospheric ozone by up to 5 parts per billion, consistent with independent satellite observations. The global total tropospheric ozone burden declined by 6TgO(3) ( approximately 2%) in May and June 2020, largely due to emission reductions in Asia and the Americas that were amplified by regionally high ozone production efficiencies (up to 4 TgO(3)/TgN). Our results show that COVID-19 mitigation left a global atmospheric imprint that altered atmospheric oxidative capacity and climate radiative forcing, providing a test of the efficacy of NO (x) emissions controls for co-benefiting air quality and climate.