@article {20738,
	title = {Rapid SO2 emission reductions significantly increase tropospheric ammonia concentrations over the North China Plain},
	journal = {Atmospheric Chemistry and Physics},
	volume = {18},
	number = {24},
	year = {2018},
	pages = {17933-17943},
	isbn = {1680-7324},
	author = {Liu, Mingxu and Huang, Xin and Yu Song and Xu, Tingting and Shuxiao Wang and Zhijun Wu and Min Hu and Lin Zhang and Qiang Zhang and Pan, Yuepeng and Liu, Xuejun and Zhu, Tong}
}
