An International Symposium on Arctic Air Pollution was held at the Scott Polar Research Institute, Cambridge, England, 2–5 September 1985. The conference, sponsored by the State of Alaska through the University of Alaska at Fairbanks, involved participants from the circumpolar region in discussions about the location of pollution sources and transport pathways, climatic influences of Arctic air pollution, and possible effects on human health. On the final day participants considered issues of international scientific cooperation and state responsibility; the latter topic included the difficult subject of international liabilities regarding the transfer of pollutants across international boundaries. In view of its multinational, even multi-continental character, the problem of Arctic air pollution is perhaps the quintessential example of such transferral and its attendant problems. This symposium volume contains edited versions of the papers presented at the four-day meeting in Cambridge, and the conclusions and recommendations adopted by consensus among the participants. This was not the first symposium devoted to the phenomenon of Arctic air pollution. Indeed, the first conference during which the subject of Arctic haze was discussed was held in Norway in 1977. At that conference it was agreed to try and set up a loosely coordinated, informal Arctic Chemical Network to share data on atmospheric chemistry. In retrospect this informal agreement represented a superb example of unselfish international cooperation.