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Dour, nestled in the heart of Wallonia, Belgium, occupies a gently undulating landscape within the broader Haine valley. Its coordinates (50.3979, 3.7807) place it approximately 30km southwest of Brussels, positioning it within a significant urban corridor yet retaining a distinctly provincial character. The terrain is characterised by loess soils, typical of the region, contributing to fertile agricultural land surrounding the town. The River Haine flows nearby, influencing local microclimates and potentially contributing to humidity-related pollution dispersion. While not heavily industrialised itself, Dour is situated within a region historically marked by coal mining and more recently, logistical and manufacturing activity concentrated around larger urban centres like Mons and Charleroi. This proximity means Dour can experience pollutant transport from these sources. The urban-rural gradient is relatively sharp; immediately surrounding the town are agricultural fields, transitioning to more densely populated areas towards Mons. This gradient impacts air quality, with rural areas offering some natural filtration, while the town itself experiences concentrated emissions from traffic and domestic heating. The relatively flat topography can also contribute to the trapping of pollutants during stable atmospheric conditions, particularly in winter.

Dour’s air quality follows a predictable seasonal pattern. Winter (December-February) typically sees the poorest air quality, driven by increased reliance on solid fuel heating – wood and coal – for residential warmth. Temperature inversions, common in the Haine valley during cold, still weather, exacerbate this, trapping pollutants near ground level. February often represents a peak in particulate matter concentrations. Spring (March-May) brings gradual improvement as heating demand decreases and vegetation begins to absorb pollutants. However, agricultural activities, including fertiliser application, can contribute to ammonia emissions. Summer (June-August) generally offers the cleanest air, aided by prevailing winds and higher temperatures promoting pollutant dispersion. However, occasional heatwaves can lead to increased ozone formation. Autumn (September-November) sees a deterioration as heating systems are reactivated and damp conditions can favour pollutant accumulation. October and November are often marked by increased particulate matter due to leaf fall and damp weather. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and periods of stagnant air. Monitoring local forecasts is crucial, and avoiding peak traffic hours can further reduce exposure.