http://publications.europa.eu/resource/authority/language/ENG Raquel Trillo Zaragoza, Daily air quality observation coverage, NO2 MIN (2020-11) TRAFAIR-2020-033 The dataset provides the daily evolution of the estimation of the minimum concentrations of NO2 pollutant. Universidad de Zaragoza 16/11/2020 http://zaguan.unizar.es/record/94404 http://zaguan.unizar.es/record/94404