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Biganos, nestled in the Nouvelle-Aquitaine region of southwestern France, presents a unique geographic context influencing its air quality. Situated at coordinates 44.6450, -0.9772, the town lies approximately 25km southwest of Bordeaux, benefiting from a relatively flat terrain characteristic of the Landes forest. This vast pine forest, the largest in Europe, dominates the surrounding landscape, acting as a natural filter but also contributing to biogenic volatile organic compounds (BVOCs). The Leyre river flows nearby, influencing local humidity and potentially trapping pollutants during temperature inversions. Biganos isn’t heavily industrialised; its economy is largely driven by tourism, forestry, and agriculture – primarily pine cultivation and viticulture. The urban-rural gradient is pronounced, with the town centre transitioning quickly to expansive forested areas. This proximity to natural landscapes generally favours better air quality than more densely populated, industrialised cities. However, seasonal agricultural practices, including the use of fertilizers and pesticides, can contribute to localised air pollution. The coastal influence from the Atlantic Ocean, approximately 30km west, introduces salt spray and marine aerosols, impacting particulate matter composition. Understanding this interplay of forest, river, agriculture, and coastal proximity is crucial for assessing Biganos’ air quality.

Biganos experiences a temperate oceanic climate, resulting in distinct seasonal air quality patterns. Spring (March-May) sees increasing agricultural activity, potentially elevating particulate matter from soil disturbance and ammonia from fertilizer application. Gentle breezes typically disperse these pollutants, but stagnant conditions can lead to localised build-up. Summers (June-August) are generally favourable, with prevailing winds from the Atlantic flushing out pollutants and high temperatures promoting dispersion. However, increased ozone formation due to strong sunlight and BVOC emissions from the Landes forest can be a concern. Autumn (September-November) brings increased rainfall, effectively scavenging pollutants from the air, leading to improved air quality. However, the onset of heating systems in November can introduce combustion-related pollutants. Winters (December-February) are characterised by cooler temperatures and increased risk of temperature inversions, trapping pollutants near the ground. Fog, common during these months, exacerbates particulate matter concentrations. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during inversion events, particularly in November and December. Monitoring pollen levels is also important in spring and summer.