Air pollution — key message 5

As European emissions decrease, there is increasing recognition of the importance of inter-continental transport of air pollutants and its contribution to poor air quality in Europe. This contribution is particularly large for ozone, persistent organic pollutants, and mercury, and for particulate matter during air pollution episodes. Further international cooperation to mitigate inter-continental flows of air pollution will help nations meet their own goals and objectives for protecting public health and environmental quality.