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Thouars, nestled in the heart of Nouvelle-Aquitaine, France, occupies a unique geographical position within the Deux-Sèvres department. The city is situated on a prominent plateau overlooking the Thouet River valley, at an elevation of approximately 130-160 meters. This elevated position, while offering strategic views and historical defensive advantages, can contribute to localised temperature inversions, trapping pollutants during calm weather conditions. The surrounding landscape is predominantly agricultural, characterised by rolling hills and farmland dedicated to cereal crops and livestock rearing. This agricultural activity, while vital to the regional economy, introduces potential sources of particulate matter (PM10 and PM2.5) from field work, fertiliser application, and animal husbandry. Thouars isn’t directly within a major industrial belt, but benefits from transport links, including the N79, which can contribute to road traffic emissions. The urban-rural gradient is relatively sharp; the city centre gives way quickly to open countryside. The Thouet River itself, while a scenic asset, doesn’t provide significant dispersion of pollutants due to its relatively narrow width and the surrounding topography. The prevailing winds, generally from the west, can influence pollutant transport, but the plateau’s topography can create localised wind shadows, exacerbating air quality issues in certain areas.

Thouars experiences a temperate oceanic climate, resulting in distinct seasonal air quality patterns. Winter (December-February) often sees poorer air quality due to increased residential heating, particularly wood burning, leading to elevated PM2.5 levels. Calm, stable atmospheric conditions and frequent temperature inversions trap pollutants near ground level. Spring (March-May) brings improvements as temperatures rise and heating demand decreases, but agricultural activities begin, potentially increasing particulate matter from soil disturbance. Summer (June-August) generally offers the best air quality, with prevailing winds aiding dispersion and reduced heating needs. However, heatwaves can trigger ozone formation, a secondary pollutant. Autumn (September-November) sees a return to poorer conditions as heating resumes and agricultural harvesting contributes to dust. Fog, common in autumn and winter mornings, can exacerbate particulate pollution. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during periods of calm weather, especially in winter and autumn. Monitoring pollen levels is also crucial in spring and summer. Months to favour for outdoor activity are June, July and August, but always check local forecasts.