Hajduk-Stelmachowicz, M., Bełch, P., Szczygieł, E., Fura, B., & Frankiewicz, M. P. (2025). Impact of COVID-19 pandemic on the air quality of polish cities – challenges for managers. Economics and Environment, 90(3), 784. https://doi.org/10.34659/eis.2024.90.3.784