The 27th Task Force Meeting was held from 28-30 January, 2014 in Paris, France. The meeting was hosted by the French Environment and Energy Management Agency (ADEME), in collaboration with AgroParisTech, INRA, Muséum national d’Histoire naturelle (MNHN) and Université Paris-Est Creteil (UPEC). On the first day an ozone workshop was held to discuss progress with ozone risk assessment methodologies.