This is potentially a quick interim fix to diesel pollution that could be quickly adopted at the refining industry level by a handful of major oil companies rather than through vehicle purchases that could take decades to phase in.
Scientists are exploring a surprisingly simple way to clean up diesel engines: adding tiny droplets of water to the fuel. During combustion, the water rapidly vaporizes, triggering micro-explosions that improve fuel mixing and lower combustion temperatures.
Studies show this technique can slash nitrogen oxide and soot emissions by more than 60% while sometimes even improving engine efficiency. Because it works in existing engines without redesign, it could provide a quick path to cleaner diesel use.
From Science Daily citing:
Chukwuemeka Fortunatus Nnadozie, et al. "Advancements in diesel emission reduction strategies: a focus on water-in-diesel emulsion technology" 4(1) Carbon Research (2025) DOI: 10.1007/s44246-025-00210-y
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