Towards cleaner air: Scientific Assessment Report 2016

This assessment report summarises current scientific knowledge on transboundary air pollution issues within the UNECE region and describes the effectiveness of air pollution measures in addressing large-scale effects on forests and lakes as well as in protecting human health and preventing other air pollution effects, such as loss in biodiversity and damage to crops, the built environment and cultural heritage. The assessment of emission reduction achievements is based on a report on trends in air pollution and impacts coordinated by the Working Group on Effects, a report on air pollution trends between 1990 and 2012 by the EMEP Task Force on Measurements and Modelling, and an assessment for North America by the U.S. Environmental Protection Agency (EPA) and Environment and Climate Change Canada. Opportunities identified for means to tackle remaining challenges are mainly based on work by the EMEP Task Force on Hemispheric Transport on Air Pollution, the Meteorological Synthesizing Centre-West, the Meteorological Synthesizing Centre-East, and the Centre on Integrated Assessment Modelling. The aim of this assessment is to serve as a basis for considering new directions for policy development and for identifying policy-relevant research questions. The international co-operative approach, which includes interaction between science and policy, as developed under the Convention, provides a good basis for exploring synergies between air pollution and climate change, agriculture and biodiversity, and energy and public health policies on the urban, national, continental and hemispheric scale.

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