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Large-scale citizen science protocol provides high-resolution nitrogen dioxide values while enhancing community knowledge and collective action Perelló, Josep, 1974- Targa, Jaume Daher, Carolyn Alonso, María Francis, Louise Masha-Caminals, Amanda Bonhoure, Isabelle Cigarini, Anna Vicens, Julián Carrasco Turigas, Glòria Ciència ciutadana Qualitat de l'aire Escoles Citizen science Air quality Schools We present an already tested protocol from a large-scale air quality citizen science campaign (xAire, 725 measurements, see Ref. [1]). A broad partnership with 1,650 people from communities including 18 primary schools in Barcelona (Spain) provided the capacity to obtain unprecedented high-resolution NO2 levels. Communities followed the protocol to select measurement points and obtain NO2 levels from outdoor locations n=671, playgrounds n=31, and inside school buildings (primarily classrooms) n=23. Data was calibrated and annualized with concentration levels from the city´s automatic air quality monitoring reference stations [2]. 2022-03-09T18:51:15Z 2022-03-09T18:51:15Z 2021-08-01 2022-03-09T18:51:15Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.1016/j.mex.2021.101475 MethodsX, 2021, vol. 8, p. 101475 https://doi.org/10.1016/j.mex.2021.101475 cc-by (c) Perelló, Josep, 1974- et al., 2021 https://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Elsevier Articles publicats en revistes (Física de la Matèria Condensada)