Abstract
In the course of time, the framing of the air pollution issue has undergone a transformation. It is no longer viewed as either a local health issue or a transboundary problem affecting ecosystems but as a global issue that manifests at various levels and has links to various problems. This poses a challenge for processes fostering data collection, international cooperation, and science and policy networking to deal with the issue in its various manifestations. The experience at the Air Convention, officially the Convention on Long-range Transboundary Air Pollution (CLRTAP) of the United Nations Economic Commission for Europe (UN-ECE), shows that interaction between science and policymaking at various levels of scale can enhance each other if certain conditions are met. Alignment of, for example, air policy, climate policy, nitrogen policy, health policy, and biodiversity policy not only asks for cooperation at different scales (i.e., at the local, national, regional, and global levels) but also between different arenas of decision-making and negotiation. This means that joint processes of science and policy development are needed to identify where problem formulations meet, how procedures for data collection match or which indicators are comparable, and what is possible with regard to aligning sequence and focus of policymaking. These do not necessarily need to be, or even should be, processes leading to full integration of policymaking or scientific assessment. However, successful joint processes make clear to decision-makers what the (co-)benefits of certain emission reduction measures are for various policy problems while providing a more complete picture of the cost-effectiveness of these measures. History has shown that decision-makers start acting when they can see the benefits of certain policy options or when the costs of inaction exceed those of action. Policy options might range from emission reduction measures to investments in scientific infrastructure and international cooperation. It also helps when problems are viewed as relevant by those who have the power and resources to act. Observations, measurements, and scientific assessment have the potential to point to this relevance but so does informed, critical public opinion. Current international cooperation is aimed at maintaining a network of experts and continuing efforts in capacity building in countries. Also in cities, capacity building is crucial, which is more and more supported by citizen-led air quality monitoring initiatives.
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