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Wervik, nestled in the heart of Flanders, Belgium, occupies a geographically strategic position within the Westhoek region. Its coordinates (50.7833, 3.0333) place it relatively low-lying, averaging around 20-30 meters above sea level, characteristic of the Belgian coastal plain. The city’s terrain is gently undulating, primarily agricultural, with fields of arable land and pastures dominating the surrounding landscape. Wervik sits within a broad urban–rural gradient, transitioning from the denser urban fabric of nearby Kortrijk and Ypres towards more dispersed rural settlements. The Leie River, though not directly flowing through Wervik, influences the regional hydrology and microclimate, contributing to localized humidity and potential fog formation. Historically, the area’s fertile soils have supported intensive agriculture, a factor that continues to shape the landscape and, potentially, contribute to agricultural emissions. Wervik’s location is also significant due to its proximity to the E17 motorway, a major transportation artery connecting France, Belgium, and the Netherlands. This proximity introduces a constant flow of vehicular traffic, a primary source of localized air pollution. The surrounding area is a patchwork of small villages and farms, with limited heavy industry, though the broader Flanders region contains industrial belts to the north and east. The relatively flat topography can exacerbate the accumulation of pollutants, particularly during periods of stable atmospheric conditions, hindering dispersion and leading to localized air quality challenges. The prevailing westerly winds, typical of Western Europe, generally help to ventilate the area, but can also carry pollutants from upwind sources.

Wervik’s air quality experiences a distinct seasonal cycle, largely dictated by meteorological patterns. Spring (March-May) often sees a gradual improvement as temperatures rise and wind speeds increase, dispersing accumulated winter pollutants. However, agricultural activities intensify during this period, potentially releasing ammonia from fertilizers and livestock, impacting local air quality. Summer (June-August) generally offers the best air quality, with consistent winds and higher temperatures promoting ventilation. Heatwaves, though, can trigger temperature inversions, trapping pollutants near the ground, particularly in the evenings. Autumn (September-November) brings a shift towards cooler temperatures and increased rainfall, which helps to cleanse the atmosphere. However, the transition period can be marked by periods of stagnant air and fog, especially in October and November, leading to localized pollution episodes. Winter (December-February) typically presents the most challenging air quality conditions. Cold, stable air masses frequently lead to temperature inversions, trapping pollutants close to the ground. Reduced wind speeds and increased heating usage in homes contribute to elevated levels of particulate matter and nitrogen oxides. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit prolonged outdoor activity during periods of fog or temperature inversions, particularly in the mornings. Increased rainfall during the autumn months helps to mitigate some of the winter pollution, but periods of prolonged dry weather can exacerbate the problem. Awareness of weather forecasts and local air quality reports is crucial for making informed decisions about outdoor activities throughout the year.