@article{Bergmann_2021,
title={Exposure to ultrafine particles while walking or bicycling during COVID-19 closures: A repeated measures study in Copenhagen,
Denmark},
volume={791},
ISSN={0048-9697},
url={http://dx.doi.org/10.1016/j.scitotenv.2021.148301},
DOI={10.1016/j.scitotenv.2021.148301},
journal={Science of The Total Environment},
publisher={Elsevier BV},
author={Bergmann,
M.L. and Andersen,
Z.J. and Amini,
H. and Ellermann,
T. and Hertel,
O. and Lim,
Y.H. and Loft,
S. and Mehta,
A. and Westendorp,
R.G. and Cole-Hunter,
T.},
year={2021},
month=oct,
pages={148301} }