Néstor Rojas is a Chemical Engineer from Universidad Nacional de Colombia, Bogotá (1996). He received his Ph.D. from the University of Leeds, UK in 2002. He worked as an Assistant Professor at Universidad de Los Andes between 2002 and 2006, and has worked since then at Universidad Nacional de Colombia, where he is a Full Professor. His research focuses on air quality and includes the chemical characterization of particulate matter in ambient air and in emissions from various sources; the determination of the contribution of pollution sources; the estimation of pollutant emissions inventories; exposure to particulate matter in microenvironments; and the estimate of impacts of air pollution on public health. He was a Fulbright visiting researcher at the University of Wisconsin – Madison in 2015, where he worked on source apportionment at Prof. James Schauer’s lab. He is the director of the Air Quality Research Group and a member of the scientific steering committee of the International Global Atmospheric Chemistry (IGAC) project.