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https://doi.org/10.5194/egusphere-2022-848
https://doi.org/10.5194/egusphere-2022-848
 
17 Oct 2022
17 Oct 2022

Measurement Report: Rapid changes of chemical characteristics and health risks for high time-resolved trace elements in PM2.5 in a typical industrial city response to stringent clean air actions

Rui Li1, Meng Peng2,3, Weidong Zhao3, Gehui Wang1, and Jiming Hao2 Rui Li et al.
  • 1Key Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, Shanghai, 200241, PR China
  • 2State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, P.R. China
  • 3Institute of energy conservation and environmental protection, China Electronic Information Industry Development Research Institute, Beijing, 100084, P.R. China

Abstract. Atmospheric trace metals entail significant damages in human health and ecosystem safety, and thus a series of clean air actions have been implemented to decrease the ambient element concentrations. Unfortunately, the impact of these emission control measures on element concentrations in fine particles remained poorly understood. In our study, the random forest (RF) model was applied to distinguish the effects of emission and meteorology to trace elements in PM2.5 in a typical industrial city named Tangshan based on a three-year (2017–2020) hourly field observation. The result suggested that the clean air actions have facilitated the dramatic decreases of the deweathered concentrations of Ga, Co, Pb, Zn, and As by 72 %, 67 %, 62 %, 59 %, and 54 %, respectively. It is attributable to the strict implementation of “coal to gas” strategies and optimization of industrial structure and layout. However, the deweathered levels of Ca (8.3 %), Cr (18.5 %), and Fe (23 %) only displayed minor decreases, indicating that the emission control measures for ferrous metal smelting and vehicle emission were not very effective. The positive matrix factorization (PMF) results suggested that the contribution ratios of biomass burning, non-ferrous metal smelting, coal combustion, ferrous metal smelting, heavy oil combustion, and traffic-related dust changed from 5 %, 17 %, 20 %, 15 %, 9 %, and 34 % to 7 %, 13 %, 15 %, 14 %, 10 %, and 41 %, respectively. To date, no significant noncarcinogenic and carcinogenic risks were observed for all of the elements, while both of As and Pb still showed relatively high health damages. It was proposed to further cut down the combustion-related emissions (e.g., As and Pb) because it showed the highest marginal health benefits. Besides, the control of traffic-related emissions might be a key abatement strategy to facilitate the reduction of elements in fine particles.

Rui Li et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-848', Anonymous Referee #1, 08 Nov 2022
  • RC2: 'Comment on egusphere-2022-848', Anonymous Referee #2, 16 Nov 2022

Rui Li et al.

Data sets

Data for “Measurement Report: Rapid changes of chemical characteristics and health risks for high time-resolved trace elements in PM2.5 in a typical industrial city in response to stringent clean air actions” Li, R., Peng, M., Zhao, W. D., Wang, G. H., and Hao, J. M. https://zenodo.org/record/7031975#.Ywys8cjfmfU

Rui Li et al.

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Short summary
RF model was used to isolate the effects of emission and meteorology to trace elements in PM2.5 in Tangshan. The result suggested that the control measures facilitated the decreases of Ga, Co, Pb, Zn, and As. It is due to the strict implementation of “coal to gas” strategies and optimization of industrial structure and layout. However, the deweathered levels of Ca, Cr, and Fe only displayed minor decreases, indicating that ferrous metal smelting and vehicle emission controls should be enhanced.