@Article{acp-22-7105-2022,
AUTHOR = {Balamurugan, V. and Chen, J. and Qu, Z. and Bi, X. and Keutsch, F. N.},
TITLE = {Secondary PM$_{2.5}$ decreases significantly less than NO$_2$ emission reductions during COVID lockdown in Germany},
JOURNAL = {Atmospheric Chemistry and Physics},
VOLUME = {22},
YEAR = {2022},
NUMBER = {11},
PAGES = {7105--7129},
URL = {https://acp.copernicus.org/articles/22/7105/2022/},
DOI = {10.5194/acp-22-7105-2022}
}