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In the present study of three mining\u2010impacted Peruvian towns, nearly 2,000 students collected and tested 1,500 soil samples using a field kit that combines simulated gastric extraction with visual detection of a purple Pb rhodizonate precipitate. An additional 2,000 soil samples were tested by our team's field staff. The combined results were mapped and compared with total soil Pb concentrations measured by X\u2010ray fluorescence (XRF). The degree of soil contamination varied across sites and within each site. Quality control was provided by reanalyzing a subset of 120 soil samples from the three sites in the laboratory. Overall, total Pb concentrations were highest in Cerro de Pasco with 64% and 30% of samples in the 201\u20132,000 and 2,001\u201320,000\u00a0mg\/kg range, respectively. Total Pb concentrations were somewhat lower in La Oroya with 88% of samples in the 201\u20132,000\u00a0mg\/kg range and even lower in Callao with 79% below 200\u00a0mg\/kg. However, extractable Pb proportions followed an inverse pattern, with the sum of the proportions of medium and high visual readings increasing from 46% to 57% and 69% in Cerro de Pasco, La Oroya, and Callao, respectively. This trend relates more closely to blood\u2010Pb concentrations in children measured at the three sites 2\u00a0decades ago than total Pb concentrations. The study demonstrates that student\u2010conducted soil screening can effectively identify Pb contamination patterns while providing valuable science education.<\/jats:p>","DOI":"10.1029\/2025gh001662","type":"journal-article","created":{"date-parts":[[2026,2,10]],"date-time":"2026-02-10T09:59:02Z","timestamp":1770717542000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Soil Screening by High School Students to Map Lead Contamination From Mining in Peru"],"prefix":"10.1029","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2738-0966","authenticated-orcid":false,"given":"Johny","family":"Ponce\u2010Canchihuam\u00e1n","sequence":"first","affiliation":[{"name":"Center for Research in Environmental Health (CREEH)  Lima Per\u00fa"},{"name":"Universidad Peruana Cayetano Heredia  Lima Per\u00fa"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Franziska","family":"Landes","sequence":"additional","affiliation":[{"name":"Lamont\u2010Doherty Earth Observatory Columbia University  Palisades New York USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eda","family":"Palacios","sequence":"additional","affiliation":[{"name":"Center for Research in Environmental Health (CREEH)  Lima Per\u00fa"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Percy","family":"Ponce","sequence":"additional","affiliation":[{"name":"Center for Research in Environmental Health (CREEH)  Lima Per\u00fa"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-8077-698X","authenticated-orcid":false,"given":"Jaime","family":"Languasco","sequence":"additional","affiliation":[{"name":"Universidad Peruana Cayetano Heredia  Lima Per\u00fa"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Samantha","family":"da Silva Moura","sequence":"additional","affiliation":[{"name":"Lamont\u2010Doherty Earth Observatory Columbia University  Palisades New York USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2073-9841","authenticated-orcid":false,"given":"Alexander","family":"van Geen","sequence":"additional","affiliation":[{"name":"Lamont\u2010Doherty Earth Observatory Columbia University  Palisades New York USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"13","published-online":{"date-parts":[[2026,2,10]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1186\/s12940\u2010022\u201000936\u2010x"},{"key":"e_1_2_10_3_1","volume-title":"Lead Determination in Blood and Associated Factors in children and Pregnant Women in Quiulacocha and Champamarca Populations in Cerro de Pasco","author":"Astete J.","year":"2005"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.envres.2017.10.024"},{"key":"e_1_2_10_5_1","volume-title":"La Oroya cannot wait","author":"Cederstav A. 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