@Article{ar-4-547-2026,
AUTHOR = {L\'opez-Encuentra, \'A. and Gil Cid, E. and Pozo Coronado, L. M.},
TITLE = {Inhalation of small particles (PM$_{2.5}$) in urban road tunnels and underground in Madrid (Spain) -- a citizen science project},
JOURNAL = {Aerosol Research},
VOLUME = {4},
YEAR = {2026},
NUMBER = {2},
PAGES = {547--558},
URL = {https://ar.copernicus.org/articles/4/547/2026/},
DOI = {10.5194/ar-4-547-2026}
}