Department of Health's COMEAP review, Quantification of the Effects of Air Pollution on Health in the United Kingdom (COMEAP 1998)
1996), other studies have failed to show evidence for such a threshold for effects (COMEAP 1998).
Our use of time-series studies is consistent with the methodology used by COMEAP (1998).
However, no data are available for an overall urban mortality rate (ONS 1998), so in line with the COMEAP (1998) report, we assumed the Great Britain mortality rate to apply to both urban and rural areas.
In line with the approach of the COMEAP (1998) report, we assumed all hospital admission rates for England to apply to all urban Great Britain.