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Arnhem, nestled in the province of Gelderland, Netherlands, occupies a strategically significant position where the Veluwe heathlands meet the Rhine-Meuse valley. Its coordinates (51.9833, 5.9167) place it within a gently undulating landscape, characterized by rolling hills and riverine plains. The city’s geography is dramatically shaped by the Rhine river, which forms a natural boundary to the south, influencing local climate and providing a transportation corridor. Arnhem’s elevation varies, with higher ground to the north gradually sloping down towards the river, creating microclimates that affect pollutant dispersion. The surrounding Veluwe, a vast national park, acts as a significant green buffer, absorbing some pollutants and moderating temperatures. However, the proximity to the industrial belt of the Ruhr area in Germany, approximately 150km to the south, introduces transboundary pollution concerns. To the east lies the agricultural region of Achterhoek, contributing to ammonia emissions from livestock farming, a notable air quality challenge in the Netherlands. The urban–rural gradient is relatively sharp; Arnhem transitions quickly from a dense urban core to the expansive, forested landscapes of the Veluwe. This juxtaposition influences wind patterns, often channeling pollutants through the city’s valleys. The presence of the Sint Jansbeek, a smaller stream flowing through Arnhem, also impacts local humidity and temperature, subtly affecting atmospheric chemistry and pollutant behaviour. The city’s location within a densely populated region of the Netherlands means it is susceptible to regional pollution events.

Arnhem’s air quality experiences a distinct seasonal cycle, largely dictated by meteorological conditions. Winter months (December-February) often present the greatest challenges. Temperature inversions, common during this period, trap pollutants close to the ground, leading to increased concentrations of particulate matter and nitrogen oxides. Cold, still air reduces dispersion, exacerbating the problem. Fog, frequently occurring in winter, further restricts pollutant movement. Spring (March-May) brings a gradual improvement as temperatures rise and wind speeds increase, dispersing pollutants more effectively. However, agricultural activities intensify during spring, leading to elevated ammonia levels from fertilizer application and livestock. Summer (June-August) generally offers the best air quality, with consistent winds and higher temperatures promoting good ventilation. However, occasional heatwaves can lead to ozone formation, a secondary pollutant. Autumn (September-November) sees a transition period, with decreasing temperatures and increasing rainfall. While rainfall helps to cleanse the atmosphere, stagnant air periods can still occur, particularly in October. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should be particularly cautious during winter and early spring, limiting outdoor activity on days with poor air quality forecasts. During the warmer months, monitor ozone levels and avoid strenuous outdoor exercise during peak ozone hours. The agricultural landscape surrounding Arnhem means that ammonia levels are a persistent concern, impacting air quality year-round, though most acutely during spring and summer.