Perelló, Josep, 1974-Targa, JaumeDaher, CarolynAlonso, MaríaFrancis, LouiseMasha-Caminals, AmandaBonhoure, IsabelleCigarini, AnnaVicens, JuliánCarrasco Turigas, Glòria2022-03-092022-03-092021-08-012215-0161https://hdl.handle.net/2445/183969We 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].application/pdfengcc-by (c) Perelló, Josep, 1974- et al., 2021https://creativecommons.org/licenses/by/4.0/Ciència ciutadanaQualitat de l'aireEscolesCitizen scienceAir qualitySchoolsinfo:eu-repo/semantics/article7187172022-03-09info:eu-repo/semantics/openAccess