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Bourges, nestled in the heart of the Centre-Val de Loire region of France, occupies a geographically significant position within a gently undulating landscape. Situated at approximately 128 meters (420 feet) above sea level, the city’s terrain is characterized by a broad, alluvial plain formed by the Cher River, which bisects the urban area. This riverine influence moderates local temperatures and contributes to a relatively humid microclimate. Bourges lies on the edge of the Sologne forest, a vast area of sandy soils and pine forests extending south and east, impacting regional wind patterns and contributing to occasional particulate matter transport. The surrounding landscape is predominantly agricultural, with extensive fields of wheat, barley, and rapeseed dominating the rural areas, a factor influencing seasonal emissions from farming practices. To the west, the urban–rural gradient transitions relatively quickly to rolling hills and woodlands. Bourges’ location, while inland, isn’t isolated; it sits along key transportation routes, including the A71 autoroute, which can contribute to localized traffic-related air pollution. The city’s historical layout, with its medieval core and subsequent expansion, has resulted in a mix of narrow, winding streets and wider boulevards, influencing ventilation patterns and potentially trapping pollutants in certain areas. The absence of significant industrial belts directly adjacent to Bourges mitigates some pollution risks, but regional agricultural activity and transportation corridors remain key factors shaping its air quality profile.

Bourges experiences a temperate climate, and consequently, its air quality follows a distinct seasonal pattern. Spring (March-May) often sees a gradual improvement in air quality as temperatures rise and winds increase, dispersing accumulated winter pollutants. However, agricultural activities, including fertilizer application and pesticide spraying, can contribute to localized spikes in ammonia and particulate matter. Summer (June-August) generally offers the best air quality, with consistent sunshine, higher wind speeds, and reduced agricultural emissions. However, periods of intense heat can lead to stagnant air and ozone formation, particularly during prolonged dry spells. Autumn (September-November) marks a transition period, with decreasing daylight hours and cooler temperatures. The burning of agricultural residues, a common practice in the region, can significantly degrade air quality during this time, especially in rural areas surrounding Bourges. The most challenging period is winter (December-February), when cold, stable air masses frequently lead to temperature inversions. These inversions trap pollutants near the ground, resulting in elevated levels of fine particulate matter and nitrogen oxides. Fog, common during winter mornings, exacerbates this issue by further reducing dispersion. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during periods of stagnant air or fog, particularly in the mornings. Increased ventilation in homes and awareness of local air quality forecasts are crucial for mitigating health risks during these periods.