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Aix-en-Provence, nestled in the heart of Provence-Alpes-Côte d'Azur, France, occupies a geographically significant position within a landscape sculpted by millennia of geological activity. The city’s terrain is gently undulating, situated on a broad plain between the slopes of the Montagne Sainte-Victoire to the east and the rolling hills of the Luberon to the west. This location, at approximately 43.5263° N, 5.4454° E and an elevation of around 200 meters, influences its microclimate and, consequently, its air quality. The Montagne Sainte-Victoire, a prominent geological landmark, acts as a partial barrier, sometimes trapping pollutants, while the Luberon hills contribute to localized wind patterns. The surrounding landscape is predominantly agricultural, characterized by vineyards, olive groves, and lavender fields, which can contribute to seasonal particulate matter, particularly during harvest periods. Aix-en-Provence benefits from its proximity to the Mediterranean Sea, roughly 30 kilometers south, which introduces a maritime influence, moderating temperatures and occasionally providing cleansing sea breezes. However, this proximity also means the city can be affected by transboundary pollution from coastal industrial areas and shipping traffic. The urban-rural gradient is relatively gradual, with smaller villages and agricultural land seamlessly blending into the city’s periphery. While not directly adjacent to major industrial belts, the region’s transport infrastructure, including highways and rail lines, contributes to localized traffic-related emissions. The city’s urban character is defined by its historic center, characterized by narrow, pedestrianized streets, and its expanding suburbs, which introduce a mix of residential and commercial development, further impacting air quality dynamics.

Aix-en-Provence experiences a Mediterranean climate, profoundly shaping its air quality throughout the year. Summers (June-August) are typically hot and dry, often accompanied by stagnant air conditions. High temperatures and minimal wind lead to temperature inversions, trapping pollutants close to the ground, particularly those from vehicle emissions and regional agricultural activities. This period sees a potential increase in ozone formation, exacerbated by intense sunlight. Spring (March-May) and Autumn (September-November) generally offer improved air quality, with more frequent breezes dispersing pollutants. However, autumn can bring agricultural burning, contributing to particulate matter. Winter (December-February) presents a mixed picture. While cooler temperatures can reduce ozone formation, the increased use of domestic heating, often reliant on wood or other biomass fuels, can elevate particulate matter levels, especially during periods of cold, still weather. Fog, common in winter mornings, further exacerbates this issue by trapping pollutants. The agricultural cycle also plays a role; tilling and harvesting activities release dust and organic matter into the air. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during summer heatwaves and winter cold snaps, limiting strenuous outdoor activity and monitoring local air quality information. Periods of prolonged drought, increasingly common due to climate change, can worsen air quality by increasing dust levels and reducing the effectiveness of natural air purification processes.