Shields against pollution: phytoremediation and impact of particulate matter on trees at Wigry National Park, Poland

This study examines the impact of airborne particulate matter (PM) and associated trace elements (TEs) on deciduous and coniferous trees at the edge of Wigry National Park in northeast Poland, focusing on pollution levels and the potential for phytoremediation. Researchers measured PM concentrations in the air and on the leaves of <i>Picea abies</i>, <i>Quercus robur</i>, and <i>Corylus avellana</i>, along with photosynthetic indicators (Fv/Fm ratio and performance index). The study found significant differences in pollution intensity across areas with varying levels of human activity. <i>P. abies</i>, an evergreen species, accumulated the highest PM levels (>200 μg/cm²), while <i>Q. robur</i> had the highest accumulation among deciduous trees (>50 μg/cm²). Trace elements such as Fe, Cu, Zn, Sr, and Cd were detected, with <i>C. avellana</i> being the most efficient in accumulating Cd (up to 7.5 mg/kg). The accumulation of pollutants correlated with reduced photosynthetic efficiency in trees closest to pollution sources. The findings suggest that strategically planting specific tree species can help mitigate air pollution in national parks and protect sensitive vegetation. Future research should explore the long-term effects of PM on forest health and the role of different species in phytoremediation.