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Soil samples were systematically collected through a grid-based sampling approach to analyze the spatial distribution and vertical migration characteristics of key pollutants such as benzene, trichloroethylene, formaldehyde, and hexachlorocyclohexane (\u03b1-HCH). The results revealed that the distribution of pollutants closely corresponded to the historical production functional zones and exhibited three typical vertical patterns: \u201cdeep-layer migration-shallow-layer distribution-surface-layer enrichment.\u201d Health risk assessment based on the RAG-C model indicated that unacceptable carcinogenic risks would exist if the site were developed for Class I land use, with benzene being the primary carcinogenic contributor, while the noncarcinogenic risks of \u03b1-HCH were mainly attributed to oral ingestion and dermal contact pathways. Compared to comprehensive industrial parks, this site was predominantly contaminated by volatile solvents and pesticides, highlighting the shaping effect of industrial structure on the pollution profile. This study provides a scientific basis and practical reference for precise investigation, risk assessment, and zoning remediation of similar chemical legacy sites.<\/jats:p>","DOI":"10.1093\/etojnl\/vgag082","type":"journal-article","created":{"date-parts":[[2026,3,26]],"date-time":"2026-03-26T17:04:51Z","timestamp":1774544691000},"page":"1665-1680","source":"Crossref","is-referenced-by-count":0,"title":["Spatial distribution characteristics and health risk assessment of key organic pollutants in chlor-alkali and pesticide industries: a case study"],"prefix":"10.1093","volume":"45","author":[{"given":"Jiale","family":"Zhang","sequence":"first","affiliation":[{"name":"Key Laboratory of Intelligent Underground Detection Technology, College of Civil Engineering, Anhui Jianzhu University , Hefei,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaochuan","family":"Liu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Intelligent 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