@article {Ruprecht19, author = {Michal Ruprecht}, title = {All countries, most capital cities fail to meet WHO air standard}, volume = {52}, number = {4}, pages = {19--20}, year = {2022}, publisher = {American Public Health Association}, issn = {0028-0496}, URL = {https://www.thenationshealth.org/content/52/4/19.2}, eprint = {https://www.thenationshealth.org/content}, journal = {The Nation{\textquoteright}s Health} }