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Steenbergen, nestled in the southwestern province of Noord-Brabant, Netherlands, occupies a geographically significant position within the broader Rhine-Meuse Scheldt delta. Its coordinates (51.5842, 4.3194) place it relatively close to the North Sea coast, approximately 15 kilometers inland, influencing local weather patterns and, consequently, air quality. The terrain is predominantly flat, characteristic of the low-lying Dutch landscape, with elevations rarely exceeding 10 meters above sea level. This flatness, while beneficial for drainage, can exacerbate air pollution episodes as it limits vertical mixing and allows pollutants to accumulate. The surrounding landscape is a mosaic of agricultural fields – primarily arable land used for crops like potatoes and sugar beets – interspersed with pockets of woodland and small-scale horticulture. To the east lies a gradual transition towards more densely populated areas and industrial zones associated with the port of Antwerp, Belgium, a major source of potential transboundary pollution. Steenbergen’s urban character is that of a traditional market town, with a compact historical center radiating outwards into residential and agricultural areas. The urban–rural gradient is relatively smooth, with farmland immediately bordering the town’s periphery. The proximity to the Scheldt river, a major waterway, also introduces a potential source of localized pollution, although stringent regulations govern shipping emissions. The flat topography and agricultural surroundings combine to create a setting where meteorological conditions strongly dictate air quality, making Steenbergen susceptible to both regional and local pollution influences.

Steenbergen’s air quality experiences a distinct seasonal cycle heavily influenced by prevailing weather patterns. Spring (March-May) often brings a gradual improvement as temperatures rise, and wind speeds increase, dispersing accumulated pollutants. However, agricultural activities, including fertilizer application and pesticide spraying, can contribute to localized ammonia emissions, impacting air quality, particularly in the mornings. Summer (June-August) generally sees the best air quality, with consistent breezes and sunshine aiding in pollutant dilution. Still, periods of high pressure can lead to temperature inversions, trapping pollutants close to the ground, especially during stagnant, calm nights. Autumn (September-November) marks a shift, with increased rainfall helping to cleanse the atmosphere, but also a rise in biomass burning from agricultural residue, contributing to particulate matter. The most challenging period is winter (December-February). Cold, stable air masses frequently lead to temperature inversions, trapping pollutants and creating conditions ripe for smog formation. Fog, common during these months, further exacerbates the problem by reducing visibility and hindering pollutant dispersion. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit prolonged outdoor activity during periods of stagnant air and fog. Farmers should minimize fertilizer application during periods of low wind speed and temperature inversions. Public health advisories are often issued during these times, recommending reduced physical exertion and the use of air purifiers indoors. The interplay of temperature, wind, and agricultural practices dictates the air quality narrative throughout the year in Steenbergen.