@article {687283,
	title = {Secondary PM2.5 decreases significantly less than NO2 emission reductions during COVID lockdown in Germany},
	journal = {Atmos. Chem. Phys.},
	volume = {22},
	year = {2022},
	pages = {7105-7129},
	url = {https://acp.copernicus.org/articles/22/7105/2022/},
	author = {Vigneshkumar Balamurugan and Chen, Jia and Zhen Qu and Xiao Bi and Keutsch, Frank N.}
}
