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This report assesses progress in 2018 toward implementing the Global Strategy to Introduce Low-Sulfur Fuels and Cleaner Diesel Vehicles of the Climate and Clean Air Coalition (CCAC). The rapid reduction of diesel black carbon emissions is one element of a multi-pollutant and multi-sectoral strategy proposed by the CCAC Scientific Advisory Panel (SAP) to reduce near-term climate warming by an average of 0.5°C over 25 years. To achieve this target, emissions of black carbon from all sectors must fall to 75% below 2010 levels by 2030. The Heavy-Duty Vehicles (HDV) Initiative of the CCAC released its global strategy in 2016 with the aim for all countries to implement vehicle emissions and fuel quality requirements equivalent to Euro 4/IV by 2025 and Euro 6/VI by 2030. This study finds that this strategy, if fully implemented, can reduce diesel black carbon emissions to 88% below 2010 levels by 2040 but that higher ambition—equal to Euro 4/IV implementation by 2021 and Euro 6/VI no later than 2025—is necessary to meet the emissions reduction and temperature targets proposed by the SAP.