This global assessment of sand and dust storms (SDS) has been prepared by UNEP in partnership with WMO and UNCCD, in response to calls for action on SDS. The assessment aims to synthesise the latest knowledge on the science and policy of SDS and apply this knowledge to identify elements of a comprehensive strategy for SDS mitigation at the local, regional and global levels. The report is intended to increase awareness among decision-makers and stakeholders about the opportunities for managing SDS and for encouraging partnership towards combined actions for reducing negative environmental and development impacts of SDS.