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This study examines the environmental footprint using several criteria for a dual-fuel compression ignition engine fueled with hydrogen-enriched natural gas (HCNG) and diesel pilot injection. Exhaust emissions, including detailed particle size distributions (10 nm to 10 μm) via a Dekati ELPI+ system, were coupled with Life Cycle Assessment (LCA) sensitivity analyses using ReCiPe 2016 methodologies. The climate impact was evaluated across various Global Temperature Potential (GTP) and Global Warming Potential (GWP) in various time horizons (20, 50, 100 & 500 years) using IPCC AR6 reports, comparing fossil and non-fossil fuel origins. The results demonstrate that hydrogen enrichment up to 53% vol. induces a significant shift between reduction and growth across various time horizons of the analyzed scenarios. An analysis of various scenarios made it possible to determine how a dual-fuel installation affects the climate change, but also calculation and analysis of LCA parameters show the impact of this kind of fuel instalation. Midpoints characterization of this parametres shows severe environmental trade-offs; hydrogen-induced thermal Zeldovich mechanisms escalate nitrogen oxides emissions, heavily penalizing local categories such as photochemical ozone formation (reaching growths of over 200%), terrestrial acidification (reaching growth close to 100%), and marine eutrophication (reaching growth of over 100%). Formaldehyde released in theexhaust along with unburned methane increases from several tens to several hundred percent the toxicological potential for humans and animals. Furthermore, the analysis concludes with a summary parameter indicating how an engine equipped with such a system impacts the healthy life years lost in the human population due to illness or premature death caused by exhaust emissions. In the Individual DALY scenario, this average value worsens by 55%, enabling final conclusions to be drawn.