The availability of robust and policy-relevant science on short-lived climate pollutants (SLCPs) at the global level, including on their climate and air quality impacts and actionable measures for reducing emissions, played a critical role in  the establishment of the Climate and Clean Air Coalition (CCAC).  The recommendations in the United Nations Environment Programme (UNEP) /World Meteorological Organization (WMO) UNEP/WMO Integrated Assessment of Black Carbon and Tropospheric Ozone;  the UNEP synthesis report on Near-term Climate Protection and Clean Air Benefits, as well as the synthesis report on Hydroflourocarbons HFCs and their links to climate change and ozone layer depletion form the basis for the initiatives and activities of the Coalition.

While the above assessments and much of the available science provide information on SLCPs at the global level, experience has shown that implementing SLCP emission reduction measures requires a more complete picture of the regional and local circumstances than can be provided in a global assessment.  It is therefore important to provide information and data at the regional and national levels. This will help ensure the identification, prioritization, and effective implementation of emission reduction measures tailored to the situation in different regions.

The goal of the Regional Assessments Initiative is therefore to build upon existing assessments to generate regionally-targeted data and information on SLCP science and mitigation opportunities. The initiative aims to develop scientifically robust and policy-relevant integrated assessments on SLCPs for key regions that will provide a framework for national action and underpin regional co-operation on SLCP emission reduction.

More than just a report, the process of developing the regional assessments will involve engaging governments, local policymakers, scientists, technical experts, and other key stakeholders in well-structured consultation process.  Through this process, the Initiative aims to strengthen the synergies between existing science and policy initiatives in different regions and ultimately ambitious national and regional action on mitigation of SLCP emissions.

Top facts

Significant portion of avoided premature deaths in 2030 avoided due to implementation of identified SLCP emission abatement measures will accrue in Asia and Africa.
Approximately 13%, 37% and 39% of global deaths attributed to household air pollution occurred in Africa, Low and Middle Income Western Pacific and South East Asia.
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Approximately 25% and 45% of deaths associated with ambient air pollution occurred in South East Asia and Low and Middle Income Western Pacific.


The Regional Assessment Initiative aims to develop integrated assessments on SLCP, with the goal of identifying scientifically robust emission reduction measures as well as policy actions that are relevant at the regional scale. It aims to create a platform for interaction and dialogue between science and policy with the ultimate goal of mobilizing ambitious national and regional support and action on SLCP emission abatement.  Through the development of regionally-targeted integrated assessments, the initiative seek to close scientific data and information gaps, improve the understanding of local drivers of SLCP emissions, and identify local, context-appropriate and synergistic SLCP mitigation measures and policies. 


  • The full Latin America and Caribbean (LAC) Assessment, and a technical report reviewing examples of successful SLCP measures from LAC countries was released in 2017. The report shows that implementing SLCP measures could reduce warming in the LAC region by up to 0.9˚C by 2050, reduce premature deaths from PM2.5 by at least 26% annually, and avoid the loss of up to 4 million tonnes of crops each year.
  • Asia Pacific Air Pollution Solutions Report is advancing and will be finalised in 2018. It is being produced with UN Environment and the Japan sponsored Asia-Pacific Clean Air Partnership.

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Initiative contacts

Nathan Borgford-Parnell,
Science Affairs Officer & Regional Assessment Initiative Coordinator
Nathan.Borgford-Parnell [at] un.org


Lead Partner: A Coalition partner with an active role in coordinating, monitoring and guiding the work of an initiative.

Implementer: A Coalition partner or actor receiving Coalition funds to implement an activity or initiative.

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Why are assessments at the regional level important?

Assessment at the regional level will provide scientifically robust and policy relevant foundation for action on SLCPs, tailored to the regional context. It will help bring together existing data at the regional scale that can help highlight the impacts of SLCPs and the benefits of reducing their emission. Further, a regional focused assessment can help identify mitigation measures that are relevant to specific regions or countries within a region which might not necessarily be relevant at the global scale. Furthermore, the process of consultation between scientists and policymakers in the region (which is one of the major activity in the development of the regional assessment) help increase ownership and build the political will to take action.

How can my organization get involved in the Regional Assessment Initiative?

The Regional Assessment Initiative seeks to engage organizations and institutions with science and policy expertise in the various topics related to SCLPs including on emissions, inventory, mitigation measures, modelling, and policy solutions. The initiative is opened to interested parties that can contribute to on-going assessments including for Latin America and the Caribbean, Asia and the Pacific, as well as Africa. If your organization is interested in contributing, please contact the CCAC Secretariat at ccac_secretariat@unep.org


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