The characterization of ambient levoglucosan in Beijing during summertime: Dynamic variation and source contributions under strong cooking influences - Jun Wang; Weiwei Hu; Tianle Pan; Yingkun Wang; Wei Chen; Tingting Feng; Yiyu Cai; Zi Tao; Wenhui Zhao; Zhaoce Liu; Jingxiong Liu; Shaofei Kong; et al. (Journal of Environmental Sciences, 2025)