%0 Journal Article
%T Measurement report: Variations in surface SO2 and NOx mixing ratios from 2004 to 2016 at a background  site in the North China Plain
%A Liu, X.
%A Ran, L.
%A Lin, W.
%A Xu, X.
%A Ma, Z.
%A Dong, F.
%A He, D.
%A Zhou, L.
%A Shi, Q.
%A Wang, Y.
%J Atmos. Chem. Phys.
%D 2022
%8 June 01
%V 22
%N 10
%I Copernicus Publications
%@ 1680-7324
%F Liu2022
%R 10.5194/acp-22-7071-2022
%U https://acp.copernicus.org/articles/22/7071/2022/
%U https://acp.copernicus.org/articles/22/7071/2022/acp-22-7071-2022.pdf
%U https://doi.org/10.5194/acp-22-7071-2022
%P 7071-7085