By R.E. Hester, R.M. Harrison
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Additional resources for AIR POLLUTION & HEALTH
It is felt by many that the most likely explanation of this dissimilarity in results is that day-to-day changes in morbidity indicators associated with NO are in fact causally related to another pollutant which moves closely with nitrogen dioxide in terms of ambient levels. However, many studies have found associations
between NO linked pollution and health effects and at levels well below the V WHO guidelines. It is probably inappropriate, therefore, to regard NO as a gas which we can be confident about identifying as a cause of day-to-day changes in morbidity on W.
Summary Ambient CO exposure is generally low in urban areas compared to exposure to CO through actively or passively inhaled cigarette smoke, and although some epidemiological evidence would suggest that, perhaps in certain susceptible individuals with heart disease, ambient levels can be associated with health effects, the mechanisms for these findings are far from clear. It would be prudent, however, to consider further these possible health effects, making careful allowance for co-exposures, to determine whether these effects are real or spurious.
W. S. Tunnicliffe, P. S. Burge and J. G. Ayres, Lancet, 1994, 344, 1733. J. L. Devalia, R. J. Sapsford, D. R. , Eur. Respir. , 1993, 6, 1308. J. G. Ayres, Eur. Respir. , 1998, 8, in press. 13 job:LAY01 21-9-1998 page:14 colour:1 black–text J. G. Ayres present evidence. However, the longer-term effects of nitrogen dioxide exposure, particularly when one bears in mind that oxides of nitrogen are major products of gas combustion in kitchens and levels are also elevated in rooms with a poorly serviced gas fire, may be more important in determining chronic health effects.