“…Air quality is likely to be the environmental issue of most concern in the future (Beaumont, Hamilton, Machin, Perks & Williams, 1999) and the detrimental effects of air pollution on human health and welfare are well known (Brimblecombe, 2003;Brimblecombe & Maynard, 2001;Emberson, Ashmore, & Murray, 2003). So, for instance, a report of the World Health Organization, which looked at vehicular emissions in three European countries, revealed that more people were killed prematurely by the effects of pollutants than through car accidents (WHO, 1999).…”