James Allan is a senior research fellow based at the School of Earth and Environmental Sciences at the University of Manchester and research scientist at the National Centre for Atmospheric Science (NCAS). He researches air pollution, specialising in the study of atmospheric particulates, using state-of-the-art instruments to probe their composition, their sources and their effects. These are of major importance through their impacts on air quality and human health (as PM2.5) and also their influences on weather and climate. He has performed measurements of the atmosphere in a wide variety of locations worldwide, including cities, rural areas, rainforests, mountaintops and the Arctic, making use of ground based research stations, aircraft and ships. He gained his PhD in 2004 and in 2013 was awarded the Smoluchowski Award at the European Aerosol Conference for his work in Aerosol Mass Spectrometry.