The United Nations Environment Programme's (UNEP) Transport Unit and the International Council on Clean Transport (ICCT) work together on defining and communicating black carbon emissions from transport, mitigation measures, and the importance of addressing road transport emissions for both CO₂ and non-CO₂ reduction. The recent International Workshop on Black Carbon in Latin America, held in Mexico City in October 2009 addressed the impact of black carbon emissions in several economic sectors and the contribution of black carbon and CO2 to climate change. Dr.Tami Bond and Piers Forster are proceeding as lead authors on a follow-up paper assessing the science of black carbon and climate change, to be published in 2010.

A policy-relevant summary of black carbon climate science and appropriate emission control strategies is available in English and Spanish. The French, Russian, and Chinese summaries are forthcoming. More information on the ICCT's work on black carbon may be found at http://www.theicct.org/workshopmex09.cfm.

The June 2009 policy-relevant summary assesses various mitigation strategies to reduce black carbon and carbon dioxide emissions, in particular from the transport sector. Measures include the installation of wall-flow filters which can practically eliminate black carbon emissions when used with ultra-low sulfur at 15ppm or less, introduction of low carbon fuels, high efficiency engines, lighter-weight and more aerodynamic vehicles, and even zero carbon modes of transport.