Part 1 Editorial: carbon monoxide - the unnoticed poison of the 21st century. Part 2 Domestic exposure: carbon monoxide pollution in Korea - public health implications, S.-O. Baek, S.-M. Hwang and Y.-M. Moon; carbon monoxide exposure in the home environment and the evaluation of risks to health - a UK perspective, E. Green, S. Short et al; carbon monoxide poisoning in the Midi-Pyrenees, M. Fabre, C Cabot et al; epidemiology and prevention of accidental poisoning by carbon monoxide in the east of France, J. Manel, I. Gabrion et al; diagnosis and treatment of carbon monoxide poisoning - a study among emergency physicians in Quebec, L. Jacques, G. Sanfacon et al; campaign to prevent accidental carbon monoxide poisoning in the residential setting, G. Sanfacon, L. Jacques et al. Part 3 Occupational exposure: carbon monoxide poisoning among poultry breeders, J.Y. Breurec, V. Valancony et al. Part 4 Treatment of poisoning: the new CO and Smoke Inhalation Avisory Service in the UK, K.M.L. Guy, J.K. Pimlott et al. Part 5 Animal studies: carbon monoxide generation from trihalomethane metabolism in rats, D. Pankow and B. Damme.