Article 1

‘air pollution’ means the introduction by man, directly or indirectly, of substances or energy into air resulting in deleterious effects of such a nature as to endanger human health, harm living resources and ecosystems and material property and impair or interfere with amenities and other legitimate uses of the environment, and ‘air pollutants’ shall be construed accordingly;

‘long-range transboundary air pollution’ means air pollution whose physical origin is situated wholly or in part within the area under the national jurisdiction of one State and which has adverse effects in the area under the jurisdiction of another State at such a distance that it is not generally possible to distinguish the contribution of individual emission sources or groups of sources.