EN
Emissions of gaseous and particulate pollutants of the air have given rise to a host of environmental problems on global, regional and local scales. Issues such as global warming, ozone layer depletion, acid deposition and urban air pollution have received considerable attention in recent years and have been the focus of major international research projects and collaborative monitoring programmes. In the last twenty years there has been a strong need for an integrated approach to air quality in urban and remote areas by developing environmental information technology. The most important international efforts in this field are presented in this review.