The AIRCLAIR project (Improvement in the environmental impact and reduction in the consumption of heavy fuel engines, by infra-red analysis) constitutes an efficient and innovative solution for the reduction of the consumption of marine engines and their polluting emissions.For electronic injection engines with a power higher than 500 KW, AIRCLAIR is aimed at designing, developing and producing a system combining miniature sensors with real time software and monitoring control. This involves continuous analysis of fuel quality at the engine input level and then instantaneously changing engine settings. The goal is to constantly optimise engine performance depending on the actual quality of the fuel (heavy fuel, natural or waste gas). The goals set are a 5 % or higher consumption saving, as well as an l % to 3 % reduction in the operational costs of vessels, and consequently a reduction in polluting gas emissions. This technological innovation lies in the extreme miniaturisation of the measurement system and the development of fine-tuned interpretation and real-time treatment software. For the first time in the world, fuel quality is regarded as a major parameter. The AIRCLAIR project was accredited by the PACA Competitiveness Marine Cluster during its steering committee meeting of 17 October 2008. It represents a R&D budget in the amount of 3.7M€ over 36 months.