On December 10-12, in Zhuhai珠海, many of us attended the annual bilateral workshop of  Guangdong-Hong Kong-Macao Joint Laboratory on Environmental Processes and Pollution Control, which is mainly between SKLAET and FCE of Hong Kong Polytechnic University (HKPolyU).  I gave an opening talk with a title of Old Path White Clouds（故道白云）, for a retrospective view of the mass spectrometry (MS)’s iteration and evolution in SKLOG-SKLAET with emphasis on the MS emplacement and performance in our group.  Guangcai钟广财 presented new progress ion the application of BPCA to studying BC’s role in aerosol light absorption properties and toxicity. Jiang Longfei江龙飞 talked on the microbial processes involved in the degradation of OPEs in soil. Li Jing李静 gave a nice talk on plant ¹⁴C monitoring and modelling in Shenzhen, and was awarded the Best Oral Presentation; Shaojun吕少君 introduced her extraordinary results of aqueous formation of hydrophilic organophosphorus esters (OPEs); Buqing and Jianchu 马建初 both presented their posters, and Jianchu’s poster on micro and nano-PVC plastics as vectors of chlorinated paraffins (CPs) in the atmosphere was awarded the Best Poster Presentation. Shizhen赵时真 and Buqing徐步青 attended the workshop and contributed in their discussion sessions.  Buqing步青 reported to the workshop on the discussion results  by on behalf of the PDRAs group. Luo Chunling 罗春玲chaired a session; and Jibin 李继兵and Longfei江龙飞 helped in looking after the organizations of the workshop. We met many friends from both Hong Kong and Sun-Yat-San University, including professors Li Xiangdong李向东 and Zou Shichun邹世春, Haoyu蒋昊余, Tan Yujun谭羽俊 etc. Nice food and nice hotel, a great and memorable annual gathering!