@article {34105,
	title = {Current challenges of improving visibility due to increasing nitrate fraction in PM2.5 during the haze days in Beijing, China},
	journal = {ENVIRONMENTAL POLLUTION},
	volume = {290},
	year = {2021},
	url = {https://www.sciencedirect.com/science/article/pii/S0269749121016146?via\%3Dihub},
	author = {Hu SY,Hu M*}
}
