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However, when monitoring, many significant variables are often overlooked, such as sensor specifications, the position of the system with respect to the airflow path (or occupants), and the relationship between these variables and the ventilation system of the room. With the purpose of properly standardizing future indoor air quality measurements in classroom settings, this study evaluated the results of a measurement campaign consisting of 33 individual measurements performed on site during 5 months in primary schools and university classrooms. This work uses\n                    <jats:italic>d<\/jats:italic>\n                    CO\n                    <jats:sub>2<\/jats:sub>\n                    \/\n                    <jats:italic>d<\/jats:italic>\n                    <jats:italic>t<\/jats:italic>\n                    to identify CO\n                    <jats:sub>2<\/jats:sub>\n                    tendencies while taking into account classroom topology and ventilation. Results show that variables such as their position and the ventilation strategy of the room often outweigh the sensor specifications, causing spatial discrepancies beyond 100\u2009ppm. Along with the results, recommendations for future measurements are discussed in order to avoid nonrepresentative estimations of the CO\n                    <jats:sub>2<\/jats:sub>\n                    level of indoor spaces.\n                  <\/jats:p>","DOI":"10.1155\/ina\/5517242","type":"journal-article","created":{"date-parts":[[2025,3,12]],"date-time":"2025-03-12T01:18:20Z","timestamp":1741742300000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["The Reliability of CO\n                    <sub>2<\/sub>\n                    Measurements Using Low\u2010Cost Sensors: A Study of Sensor Positioning and Ventilation Strategies in Classrooms"],"prefix":"10.1155","volume":"2025","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-3713-5850","authenticated-orcid":false,"given":"Daniel","family":"Mar\u00edn","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7149-6873","authenticated-orcid":false,"given":"Alba","family":"Alegr\u00eda-Sala","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4791-9917","authenticated-orcid":false,"given":"Lluc Canals","family":"Casals","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5469-7291","authenticated-orcid":false,"given":"Marcel","family":"Macarulla","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8854-8588","authenticated-orcid":false,"given":"Jordi","family":"Fonollosa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,2,27]]},"reference":[{"key":"e_1_2_11_1_2","first-page":"6","article-title":"Revision of en 15251: indoor environmental criteria","volume":"49","author":"Olesen B. 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Prevention measures and recommendations 2020 February 2025 https:\/\/www.mscbs.gob.es\/profesionales\/saludPublica\/ccayes\/alertasActual\/nCov\/documentos\/COVID19_Aerosoles.pdf."},{"key":"e_1_2_11_16_2","unstructured":"Aireamos Letter to Governments on COVID Prevention 2021 February 2025 https:\/\/www.aireamos.org\/carta-a-los-gobiernos-sobre-prevencion-de-covid\/."},{"key":"e_1_2_11_17_2","unstructured":"UK Government Department for Education All schools to receive carbon dioxide monitors 2021."},{"key":"e_1_2_11_18_2","volume-title":"CO2 monitors to be mandatory in all Dutch classrooms","author":"Dutchnews","year":"2022"},{"key":"e_1_2_11_19_2","volume-title":"COVID-19 Reference Guide","author":"City Council of Zaragoza","year":"2021"},{"key":"e_1_2_11_20_2","unstructured":"City Council of Calahorra Subsidy Call for the Acquisition of CO2Meters for Publicly Open Establishments \u2013 City Council of Calahorra 2021 February 2025 https:\/\/calahorra.es\/tramite\/convocatoria-de-subvencion-para-la-adquisicion-de-medidores-de-co2-para-los-establecimientos-abiertos-al-publico-en-calahorra\/."},{"key":"e_1_2_11_21_2","unstructured":"Asturias Health Service New COVID-19 Measures Announcement 2022 February 2025 https:\/\/www.astursalud.es\/documents\/35439\/758798\/2022_03_03+NP+Nuevas+medidas+covid.pdf\/0c161350-5b80-59b6-b69f-0c9e97df1572?t=1646314300823."},{"key":"e_1_2_11_22_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.enbuild.2019.109358"},{"key":"e_1_2_11_23_2","doi-asserted-by":"publisher","DOI":"10.1034\/j.1600-0668.2002.08126.x"},{"key":"e_1_2_11_24_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-0668.2006.00451.x"},{"key":"e_1_2_11_25_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.buildenv.2013.11.001"},{"key":"e_1_2_11_26_2","unstructured":"MahyuddinN. 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