During the summer of 2024, forest fires in North Macedonia and Albania were associated with a noticeable increase in atmospheric loading, directly affecting air quality and the ecological processes of Lake Ohrid. The analysis of satellite data combined with kinetic modeling shows an increase in average PM₂.₅ concentrations from 16.7 µg/m³ to around 40 µg/m³ during intense fire episodes. In a 60-day simulation, biodiversity decreased by 24.7% in the baseline scenario and by 70.5% in the fire scenario, while dissolved oxygen dropped from 8.5 to 7.24 mg/L, raising the risk of hypoxia by 2–3 times. The study highlights the high sensitivity of the oligotrophic lake to nutrient deposition from PM₂.₅ and provides a simple prediction tool for environmental management. The purpose of this study is to investigate a previously underexplored pathway of phosphorus input into Lake Ohrid, namely the contribution of wildfire-derived PM₂.₅ particles transported through the atmosphere. While phosphorus loading in Lake Ohrid has traditionally been attributed to river inflows and hydrological connections, the potential role of atmospheric particulate matter during intensive wildfire episodes has not been quantitatively assessed. The study integrates satellite observations from Copernicus and NASA platforms with a kinetic modeling framework adapted to oligotrophic lake conditions. Daily PM₂.₅ concentrations, wildfire activity, aerosol optical depth, and chlorophyll-a data were combined with an extended phosphorus mass balance model to simulate an ecosystem responses during the summer wildfire period of 2024. The findings represent an important assessment, as the phosphorus content of PM₂.₅ was estimated indirectly and no in situ measurements of deposited particles were available. From an applied perspective, the proposed approach supports rapid screening and early warning assessments of wildfire related pressures on sensitive freshwater ecosystems. By linking PM₂.₅ from wildfire deposition to phosphorus ecological responses, this study extends ecological engineering applications for the protection of oligotrophic transboundary lakes. This study aims to provide the first quantitative assessment of wildfire related atmospheric phosphorus inputs to Lake Ohrid and to evaluate their short term ecological relevance under summer wildfire conditions.