Professor Jonathan Grigg is Professor of Paediatric Respiratory and Environmental Medicine at Queen Mary University of London, and an honorary consultant paediatrician at The Royal London Hospital. His research interests include air pollution and children’s health, effects of pollutants on airway cells, and the treatment of paediatric asthma. He was vice chair of the Royal College of Physicians’ working party on the long term effects of air pollution, and is a member of the committee on the medical effects of air pollutants (COMEAP).