SummaryIn the context of transboundary air pollution policy the broad ambition is to achieve reductions in the level of environmental and societal damage associated with certain pollutant concentrations and exposure rates in a cost effective manner. Policy formulation and legislative frameworks in this field, such as the current National Emissions Ceiling Directive in the European Union, are challenged by the degree of scientific complexity involved, the dispersed sources of emissions, and the inherent uncertainties associated with long range forecasting under these conditions. This paper identifies the reasons why varied forms of adaptive policy mechanisms (also termed flexibilities) are necessary and valuable in this arena, presents the critical considerations for their design and operation, reviews a selection of the more prominent options currently considered in the associated transboundary research community, and concludes with recommendations for the next set of transboundary air pollution policy frameworks.
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AbstractIn the context of transboundary air pollution policy the broad ambition is to achieve reductions in the level of environmental and societal damage associated with certain pollutant concentrations and exposure rates in a cost effective manner. Policy formulation and legislative frameworks in this field, such as the current National Emissions Ceiling Directive in the European Union, are challenged by the degree of scientific complexity involved, the dispersed sources of emissions, and the inherent uncertainties associated with long range forecasting under these conditions. This paper identifies the reasons why varied forms of adaptive policy mechanisms (also termed flexibilities) are necessary and valuable in this arena, presents the critical considerations for their design and operation, reviews a selection of the more prominent options currently considered in the associated transboundary research community, and concludes with recommendations for the next set of transboundary air pollution policy frameworks.
Keywords:Transboundary air pollution, emission ceilings, flexibility, adaptive policy, integrated assessment modelling These ceilings were estimated as the allowable combined levels of national emissions which would deliver upon a set of environmental and health related effect targets across the broader defined international region.The original ceiling setting process for 2010 was underpinned by analysis completed in 1999and represented a valuable collaborative initiative in regard to the control of emissions and associated effects which carry beyond national policy borders. However, as the 2010 process draws to a close 2 , discussions for future agreements with further ambitions are being actively discussed. Whilst the 2010 ceilings will have undoubtedly achieved significant progress in terms of environmental and health related improvements, there remain a number of lessons to be learned (see Kelly et al, 2010). This paper draws on the experiences from the 2010 process in order to...