Data enrichment toolchain: A use-case for correlation analysis of air quality, traffic, and meteorological metrics in Madrid's smart city. - Amir Reza Jafari; Víctor González; Laura Martín; Luis Sánchez; Jorge Lanza; Syed Mohsan Raza; Maira Alvi; Kanawut Kaewnoparat; Roberto Minerva; Noël Crespi (Internet Things, 2024)