The coronavirus (COVID-19) outbreak that started in December 2019 has since then spread to a large part of the world. To mitigate the dangerous outbreak of the virus, several countries have introduced regulations to limit the spreading of the virus by reducing traffic and industrial activity considerably. Following the lockdowns, many regions took steps towards reopening business activities through the rest of 2020 and into 2021. The effects of the mitigation and reopening actions can also be seen in changes in the atmospheric composition and air quality. The exceptional situation have created unique possibilities for analyzing the air quality and emissions in conditions that are normally not possible.

We welcome papers discussing the impacts of the COVID-19 pandemic related mitigation on air quality and emissions locally and globally since 2020 and into 2021. Studies involving satellite and ground based observations as well as modeling and assimilation are looked forward.