{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,21]],"date-time":"2025-12-21T06:25:25Z","timestamp":1766298325772,"version":"build-2065373602"},"reference-count":40,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2022,2,8]],"date-time":"2022-02-08T00:00:00Z","timestamp":1644278400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"European Commission - V Interreg Sudoe Programme","award":["SOE2\/P1\/E0569"],"award-info":[{"award-number":["SOE2\/P1\/E0569"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>We present a device based on low-cost electrochemical and optical sensors, designed to be attached to bicycle handlebars, with the aim of monitoring the air quality in urban environments. The system has three electrochemical sensors for measuring NO2 and O3 and an optical particle-matter (PM) sensor for PM2.5 and PM10 concentrations. The electronic instrumentation was home-developed for this application. To ensure a constant air flow, the input fan of the particle sensor is used as an air supply pump to the rest of the sensors. Eight identical devices were built; two were collocated in parallel with a reference urban-air-quality-monitoring station and calibrated using a neural network (R2 &gt; 0.83). Several bicycle routes were carried out throughout the city of Badajoz (Spain) to allow the device to be tested in real field conditions. An air-quality index was calculated to facilitate the user\u2019s understanding. The results show that this index provides data on the spatiotemporal variability of pollutants between the central and peripheral areas, including changes between weekdays and weekends and between different times of the day, thus providing valuable information for citizens through a dedicated cloud-based data platform.<\/jats:p>","DOI":"10.3390\/s22031272","type":"journal-article","created":{"date-parts":[[2022,2,8]],"date-time":"2022-02-08T23:42:20Z","timestamp":1644363740000},"page":"1272","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["A Novel Bike-Mounted Sensing Device with Cloud Connectivity for Dynamic Air-Quality Monitoring by Urban Cyclists"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8386-0927","authenticated-orcid":false,"given":"Jaime","family":"G\u00f3mez-Su\u00e1rez","sequence":"first","affiliation":[{"name":"Escuela de Ingenier\u00edas Industriales, Universidad de Extremadura, 06006 Badajoz, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5918-1788","authenticated-orcid":false,"given":"Patricia","family":"Arroyo","sequence":"additional","affiliation":[{"name":"Escuela de Ingenier\u00edas Industriales, Universidad de Extremadura, 06006 Badajoz, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Raimundo","family":"Alfonso","sequence":"additional","affiliation":[{"name":"Ray Ingenier\u00eda Electr\u00f3nica, 10540 Mirabel, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7961-0244","authenticated-orcid":false,"given":"Jos\u00e9 Ignacio","family":"Su\u00e1rez","sequence":"additional","affiliation":[{"name":"Escuela de Ingenier\u00edas Industriales, Universidad de Extremadura, 06006 Badajoz, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5873-7580","authenticated-orcid":false,"given":"Eduardo","family":"Pinilla-Gil","sequence":"additional","affiliation":[{"name":"Facultad de Ciencias, Universidad de Extremadura, 06006 Badajoz, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0905-9546","authenticated-orcid":false,"given":"Jes\u00fas","family":"Lozano","sequence":"additional","affiliation":[{"name":"Escuela de Ingenier\u00edas Industriales, Universidad de Extremadura, 06006 Badajoz, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,2,8]]},"reference":[{"key":"ref_1","unstructured":"(2021, November 29). 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