Vertical and horizontal distribution of regional new particle formation events in Madrid. - Carnerero, Cristina; Pérez, Noemí; Reche, Cristina; Ealo, Marina; Titos, Gloria; Lee, Hong-Ku; Eun, Hee-Ram; Park, Yong-Hee; Dada, Lubna; Paasonen, Pauli; Kerminen, Veli-Matti; Mantilla, Enrique; et al. (Atmospheric Chemistry & Physics, 2018)