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Kortenberg, nestled within the Flemish Region of Belgium, occupies a geographically strategic position just outside Brussels' urban sprawl. Its coordinates (50.8865, 4.5412) place it in a gently undulating landscape, part of the broader Brabant Limburg region, characterized by a mix of agricultural land and increasingly suburban development. The terrain is relatively flat, averaging around 90-120 meters above sea level, which can unfortunately exacerbate air quality issues by limiting dispersion of pollutants. Kortenberg sits within the Campine region, historically a zone of sandy soils and heathlands, now largely transformed by intensive agriculture – primarily arable farming and horticulture – contributing to potential sources of ammonia and particulate matter. The city is not directly adjacent to major waterways, though it benefits from proximity to the Zenne River basin, influencing local humidity and microclimates. Its location, approximately 15 kilometers east of Brussels, means it experiences the urban influence of the capital, including traffic emissions and industrial activity from surrounding areas. The urban–rural gradient is noticeable; Kortenberg exhibits a transition from agricultural fields to residential areas and light industrial zones, with pockets of green space interspersed throughout. This blend creates a complex interplay of pollution sources and natural mitigating factors. The surrounding landscape, a patchwork of fields and forests, offers some buffering capacity, but the increasing urbanization and proximity to major transport routes present ongoing challenges to maintaining clean air. The relatively low elevation and flat terrain contribute to a tendency for pollutants to accumulate, particularly during periods of stable atmospheric conditions.

Kortenberg’s air quality experiences a distinct seasonal cycle heavily influenced by meteorological patterns. Spring (March-May) often sees elevated levels of ammonia due to increased agricultural activity, particularly fertilizer application and livestock farming, a common feature of the surrounding landscape. This is frequently coupled with periods of fog, trapping pollutants close to the ground. Summer (June-August) generally offers improved air quality, with warmer temperatures and more frequent rainfall helping to disperse pollutants. However, heatwaves can lead to stagnant air and ozone formation, a secondary pollutant. Autumn (September-November) brings a return to more challenging conditions. Cooler temperatures and calmer winds can lead to temperature inversions, where a layer of warm air sits above cooler air, preventing vertical mixing and trapping pollutants near the surface. This is often the most problematic period for air quality. Winter (December-February) is characterized by cold, still days and frequent fog, which significantly reduces air quality. The combination of reduced sunlight, lower temperatures, and limited wind speeds creates ideal conditions for pollutant accumulation. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit prolonged outdoor activity during periods of fog and temperature inversions, particularly in the autumn and winter months. During the spring, minimizing exposure during peak agricultural activity is advisable. While summer generally offers better conditions, heatwaves warrant caution due to potential ozone levels. Overall, the months of October, November, and December tend to present the most significant air quality challenges in Kortenberg.