• Arshad, A. S. Hussain, F. Saleem, M. Shafeeque, S. N. Khan, M. S. Waqas: Unprecedented reduction in airborne aerosol particles and nitrogen oxide level in response to COVID-19 pandemic lockdown over the Indo-Pak region. ESSOArhttps://doi.org/10.1002/essoar.10503543.1, 2020.
  • Bekbulat, B., J. S. Apte, D. B. Millet, A. Robinson, K. C. Wells, J. D. Marshall: PM 2.5 and ozone air pollution levels have not dropped consistently across the US following societal covid response, ChemRxiv, https://doi.org/10.26434/chemrxiv.12275603.v3, 2020.
  • Cicala, S., S. P. Holland, E; T. mansur, N. Z. Muller, A. J. Yates: Expected health effects of reduced air pollution from COVID-19 social distancing, http://www.nber.org/papers/w27135, 2020.
  • Huang, X., A. Ding, J. Gao, B. Zheng, D. Zhou, X. Qi, R. Tang, C. Ren, W. Nie, X. Chi, et al.: Enhanced secondary pollution offset reduction of primary emissions during COVID-19 lockdown in China. EarthArXiv, https://eartharxiv.org/hvuzy/, 2020.
  • C. A. Keller, M. J. Evans, K. E. Knowland, C. A. Hasenkopf, S. Modekurty, R. A. Lucchesi, T. Oda, B. B. Franca, F. C. Mandarino, M. V. D. Su├írez, R. G. Ryan, L. H. Fakes and S. Pawson: Global Impact of COVID-19 Restrictions on the Atmospheric Concentrations of Nitrogen Dioxide and Ozone. ArXiv, https://arxiv.org/abs/2008.01127, 2020.
  • Lv, Z., X. Wang, F. Deng, Q. Ying, A. T. Archibald, R. L. Jones, Y. Ding, et al.: Significant reduced traffic in Beijing falied to relieve haze pollution during the COVID-19 lockdown: implications for haze mitigation. ArXiv, https://arxiv.org/abs/2006.07297v1, 2020.
  • Pandey, S. K. and V. Vinoj: Surprising increase in aerosol amid widespread decline in pollution over India during the COVID-19 lockdown. EarthArXivhttps://doi.org/10.31223/osf.io/5kmx2, 2020.
  • Schafer, B., R. Verma, A. Girl, H. He, S./ M. Shiva Nagendra, M. Khare, C. Beck: COVID-19 impact on air quality in megacities. ArXiv, https://arxiv.org/abs/2007.00755, 2020.
  • Wu, X., R. C. Nethery, B. M. Sabath, D. Braun, and F. Dominici: Exposure to air pollution and COVID-19 mortality in the United States: A nationwide cross-sectional study, MedRxiv, https://doi.org/10.1101/2020.04.05.20054502, 2020.