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Tournefeuille, nestled in the Occitanie region of southwestern France, presents a unique geographic context influencing its air quality. Situated approximately 8km south of Toulouse, the city occupies a gently undulating plain at an elevation of around 160-200 meters. This terrain, part of the broader Garonne River valley, is characterised by agricultural lands interspersed with increasingly urbanised areas. The Garonne River itself flows nearby, offering some degree of natural ventilation, but also contributing to humidity which can trap pollutants under certain conditions. Tournefeuille’s location within the Toulouse metropolitan area means it’s directly impacted by the city’s industrial and transport emissions, particularly from Toulouse–Blagnac Airport and the aerospace industry concentrated around the Pink City. The urban-rural gradient is relatively sharp, transitioning quickly from residential areas to open farmland, particularly to the south and east. This proximity to agricultural zones introduces potential sources of ammonia and particulate matter from farming activities, including fertiliser use and livestock. The prevailing winds, generally from the south-west, can carry pollutants from the Pyrenees foothills, while northerly winds can bring colder, denser air, potentially exacerbating pollution episodes. The relatively flat topography limits natural dispersion of pollutants, making Tournefeuille susceptible to localised air quality issues.

Tournefeuille’s air quality follows a distinct seasonal pattern. Winter, from December to February, often sees the poorest air quality. Low temperatures create temperature inversions, trapping pollutants near the ground, compounded by increased wood burning for heating. Calm wind conditions further exacerbate this. Spring (March-May) brings improvement as temperatures rise and rainfall increases, washing away accumulated pollutants. However, agricultural activities begin to ramp up, potentially increasing ammonia levels. Summer (June-August) generally offers the cleanest air, with strong sunshine, higher temperatures promoting dispersion, and prevailing winds flushing out pollutants. Occasional heatwaves can, however, lead to ozone formation. Autumn (September-November) sees a gradual deterioration as heating demand increases and agricultural practices like harvesting contribute to particulate matter. Fog, common in autumn mornings, can trap pollutants, reducing visibility and impacting respiratory health. Sensitive individuals – children, the elderly, and those with respiratory conditions – should be particularly cautious during winter and autumn. Avoiding strenuous outdoor activity during peak pollution periods, monitoring local forecasts, and keeping windows closed during high-pollution episodes are recommended. The months of June, July and August generally present the most favourable conditions for outdoor activities.