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Also, in the pandemic context, ventilation in indoor environments has been proven as a good tool to control the COVID-19 infections. In this work, it is presented a low cost IoT-based open-hardware and open-software monitoring system to control ventilation, by measuring carbon dioxide (<jats:inline-formula><jats:alternatives><jats:tex-math>$$CO_2$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:mrow>\n                    <mml:mi>C<\/mml:mi>\n                    <mml:msub>\n                      <mml:mi>O<\/mml:mi>\n                      <mml:mn>2<\/mml:mn>\n                    <\/mml:msub>\n                  <\/mml:mrow>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula>), temperature and relative humidity. This system provides also support for automatic updating, auto-self calibration and adds some Cloud and Edge offloading of computational features for mapping functionalities. From the tests carried out, it is observed a good performance in terms of functionality, battery durability, compared to other measuring devices, more expensive than our proposal.<\/jats:p>","DOI":"10.1007\/s11276-021-02799-5","type":"journal-article","created":{"date-parts":[[2021,10,18]],"date-time":"2021-10-18T06:11:34Z","timestamp":1634537494000},"page":"5313-5327","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["VentQsys: Low-cost open IoT system for $$CO_2$$ monitoring in classrooms"],"prefix":"10.1007","volume":"27","author":[{"given":"Rafael","family":"Fayos-Jordan","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9138-5465","authenticated-orcid":false,"given":"Jaume","family":"Segura-Garcia","sequence":"additional","affiliation":[]},{"given":"Antonio","family":"Soriano-Asensi","sequence":"additional","affiliation":[]},{"given":"Santiago","family":"Felici-Castell","sequence":"additional","affiliation":[]},{"given":"Jose M.","family":"Felisi","sequence":"additional","affiliation":[]},{"given":"Jose M.","family":"Alcaraz-Calero","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2021,10,18]]},"reference":[{"key":"2799_CR1","unstructured":"Adafruit Industries: DHT22 temperature & humidity sensor (2016). 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