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Saint-André-de-Cubzac occupies a strategic, yet potentially vulnerable, position in the Nouvelle-Aquitaine region of southwestern France. Situated approximately 30 kilometers northeast of Bordeaux, the town lies within the Gironde department, nestled between the Garonne River to the east and extensive vineyards to the west. The terrain is generally flat, characteristic of the alluvial plains formed by the Garonne, with a slight elevation increase moving westward towards the forested areas. This proximity to the Garonne is a defining feature, influencing local microclimates and potentially aiding in the dispersion of pollutants, though also creating conditions for humidity and fog. The surrounding landscape is a mosaic of agricultural land – primarily vineyards and arable farming – interspersed with small woodlands and urban settlements. The town’s location along a major transport corridor, including the A89 motorway and railway lines connecting Bordeaux to the interior, introduces a significant source of traffic-related emissions. The urban-rural gradient is relatively sharp, transitioning quickly from the town centre to open countryside. Industrial activity is concentrated around Bordeaux, but regional distribution centres and smaller workshops within the surrounding area contribute to localised pollution sources. The prevailing winds, generally from the west, can carry pollutants from the Atlantic coast and agricultural activities inland, impacting air quality in Saint-André-de-Cubzac.

Air quality in Saint-André-de-Cubzac exhibits a distinct seasonal pattern. Winter, from December to February, often sees poorer air quality due to increased residential heating, particularly wood burning, combined with temperature inversions trapping pollutants near the ground. Calm, damp conditions exacerbate this, leading to higher concentrations of particulate matter. Spring (March-May) brings improvement as temperatures rise and heating demand decreases, though agricultural activities like fertilizer application can contribute to ammonia levels. Summer (June-August) typically offers the cleanest air, aided by prevailing winds and higher atmospheric mixing, but occasional heatwaves can trigger ozone formation from vehicle emissions. Autumn (September-November) presents a transitional period. The harvest season brings increased agricultural activity, and the return to school and work increases traffic volume. October and November often experience foggy conditions, trapping pollutants and reducing visibility. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter mornings and periods of stagnant air. Monitoring pollen levels is also crucial during spring. Avoiding peak traffic hours and being mindful of wood smoke exposure are advisable throughout the year. The Garonne’s influence can create localised humidity, potentially increasing the impact of particulate matter on respiratory health.