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Diepholz, nestled in the heart of Lower Saxony, Germany, occupies a gently undulating landscape within the Oldenburg Münsterland region. Situated at coordinates 52.6072° N, 8.3711° E, the city’s terrain is characterised by glacial deposits, resulting in fertile plains ideal for agriculture. The River Weser, though not directly adjacent, exerts a significant influence on the local climate and drainage patterns, lying approximately 20km to the east. Diepholz isn’t positioned within a major industrial belt; rather, it’s surrounded by extensive agricultural lands, primarily dedicated to crop and livestock farming. This agricultural activity contributes to particulate matter pollution, particularly during harvest seasons. The urban-rural gradient is relatively sharp, transitioning quickly from the town centre to open farmland. This proximity to rural areas generally benefits air quality compared to larger, heavily industrialised cities. However, the flat terrain can contribute to temperature inversions, trapping pollutants near the ground. The prevailing westerly winds transport pollutants from the Rhine-Ruhr metropolitan area, impacting air quality on occasion. Diepholz’s elevation is relatively low, averaging around 45 meters above sea level, further influencing dispersion patterns. The city’s compact size and relatively low population density (17,608) also play a role in its overall air quality profile.

Diepholz experiences a temperate maritime climate, resulting in distinct seasonal air quality patterns. Winter (December-February) often sees poorer air quality due to increased wood burning for heating and stable atmospheric conditions promoting temperature inversions, trapping pollutants. Fog, common during these months, exacerbates particulate matter concentrations. Spring (March-May) brings improvement as temperatures rise and winds increase, dispersing pollutants, though agricultural activities like fertilisation can introduce ammonia. Summer (June-August) generally offers the best air quality, with strong winds and rainfall effectively cleansing the atmosphere. However, heatwaves can lead to increased ground-level ozone formation. Autumn (September-November) sees a return to more stagnant conditions, coupled with agricultural harvesting, leading to increased particulate matter from field work. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter mornings and autumn harvest periods. Monitoring pollen counts is also crucial in spring. November and December are typically the months with the most concerning air quality, while June and July offer the most favourable conditions. Local weather patterns, particularly wind direction, significantly influence pollutant transport.