Social network and lifestyle in Danish adults.

on asthma prevalence, despite small numbers (n= 158), contradicts published findings for this factor but has been studied little.7 There has been no mention of the effect of solid fuel fires on asthma in the published reports but in this study a positive association was shown. The significant positive relationship between ducted air heating and wheeze also needs further investigation to confirm the findings of this study. It is important to continue to press for monitoring of and action to reduce air pollutants in relation to the increasing traffic and pollution problems at a time when asthma prevalence is increasing. 1 Strachan DP, Sanders CH. Damp housing and childhood asthma: respiratory effects of indoor air temperature and relative humidity. J Epidemiol Community Health 1989;43: 7-14. 2 Fruedenthal PC, Roth HD, Hammerstrom T, et al. Health risks of short-term SO2 exposure to exercising asthmatics. Journal of the Air Pollution Concern Association 1989;39: 831-5. 3 Perry GB, Chai H, Dickey DW, et al. Effect of particulate air pollution on asthmatics. AmJ Public Health 1983;73(1): 50-6. 4 Walters S. Air pollution and respiratory disease. Proceedings of the Royal Society of Medicine Conference 1992. London: Royal Society of Medicine, 1992. 5 Kingham S. Air pollution and respiratory health in Preston: a GIS approach. Lancaster: Lancaster University, 1993. Thesis. 6 Alexander L. The leisure activities and health ofprimary school children in coastal Lancashire. Report no. 2. Lancaster: Environmental Epidemiology Research Unit, Lancaster University, 1990. 7 Burr ML, St Leger AS, Yarnell JWG. Wheezing, dampness, and coal fires. Community Med 1981 ;3:205-9.