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Port-de-Bouc, nestled within the Bouches-du-Rhône department of Provence-Alpes-Côte d'Azur, France, occupies a unique coastal position on the Mediterranean Sea. Its coordinates (43.4058, 4.9892) place it within a relatively sheltered bay, contributing to its microclimate and influencing air quality dynamics. The town’s terrain is characterized by a gentle slope rising from the shoreline, transitioning into the surrounding hills of the Massif de l'Étoile, a range of low mountains composed primarily of limestone. This proximity to the mountains creates a funnel effect, potentially trapping pollutants under certain meteorological conditions. The surrounding landscape is a blend of urban development, small-scale agriculture (primarily vineyards and olive groves), and the rugged Mediterranean scrubland known as *maquis*. Port-de-Bouc’s location is strategically important as a fishing port and a gateway to the Mediterranean, with maritime traffic contributing a localized source of emissions. The urban–rural gradient is relatively sharp; the town itself is compact, with surrounding rural areas providing a buffer, though the proximity to the larger industrial and urban areas of Marseille, approximately 30km to the north, introduces regional pollution influences. The Mediterranean Sea itself acts as a moderating factor, influencing humidity and wind patterns, but also potentially carrying pollutants from distant sources. The relatively low elevation (averaging around 15 meters above sea level) means that inversions, a key factor in air pollution trapping, can occur frequently, particularly during calmer periods.

Port-de-Bouc’s air quality experiences a distinct seasonal rhythm dictated by Mediterranean climate patterns. Summers (June-August) are typically characterized by hot, dry conditions and light, variable winds. This often leads to temperature inversions, where a layer of warm air traps cooler air near the ground, preventing pollutants from dispersing. Maritime activity increases during the summer months, potentially contributing to localized emissions. Spring (March-May) and Autumn (September-November) generally offer improved air quality due to increased wind speeds and more frequent rainfall, which helps to cleanse the atmosphere. However, periods of calm weather can still trigger localized pollution episodes. Winter (December-February) presents a mixed picture. While rainfall is more frequent, cold, stable air masses can also lead to inversions, particularly in the mornings, trapping pollutants released from domestic heating and occasional industrial activity. Fog, common during winter, further exacerbates this issue by reducing visibility and hindering dispersion. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should be particularly cautious during periods of stagnant air, especially in the summer and winter mornings. Outdoor activities are generally best enjoyed during the spring and autumn months when wind patterns are more favourable and rainfall is more frequent. Awareness of local weather forecasts and any public health advisories is crucial for minimizing exposure to potential air quality concerns.