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Bollène, nestled in the heart of Provence-Alpes-Côte d'Azur, France, occupies a geographically significant position within the Rhône Valley. Located at approximately 44.28°N, 4.75°E, the town sits at an elevation of around 135 meters (443 feet) above sea level, contributing to a generally mild climate. The surrounding landscape is characterized by a transition zone between the fertile plains of the Rhône River and the foothills of the Southern Alps. This proximity to the Rhône is crucial; while providing irrigation for the region’s extensive agricultural lands (primarily vineyards and orchards), it also influences local air circulation patterns. Bollène’s urban character is that of a relatively small, historically significant town, retaining a traditional Provençal feel with narrow streets and stone buildings. The urban–rural gradient is gradual, with agricultural fields and small villages dominating the immediate periphery. To the west, the landscape rises gently towards the hills, while to the east, the Rhône Valley broadens. Significant industrial activity is not directly within Bollène itself, but the broader Rhône Valley region hosts industrial belts further north, impacting regional air quality. The town’s location within a valley can exacerbate air pollution episodes, particularly during periods of temperature inversion. The prevailing winds, generally from the northwest, play a vital role in dispersing pollutants, but their effectiveness is reduced under stable atmospheric conditions. The presence of the Durance River, flowing nearby, also influences local microclimates and humidity levels, which can affect the behaviour of airborne particles.

Bollène’s air quality experiences a distinct seasonal cycle driven by meteorological factors. Summers, typically from June to August, are characterized by hot, dry conditions and frequent periods of atmospheric stability. This often leads to temperature inversions, where a layer of warm air traps cooler air near the ground, hindering the vertical mixing of pollutants. Agricultural activities, including harvesting and the use of machinery, can contribute to particulate matter during this period. Spring (March-May) generally sees improved air quality as winds increase and rainfall helps to wash away accumulated pollutants. However, pollen levels can be high, impacting respiratory health. Autumn (September-November) presents a mixed picture. While winds are often stronger than in summer, the cooler temperatures can lead to fog formation, particularly in the mornings, which traps pollutants close to the ground. The burning of agricultural residues, a traditional practice in the region, can also contribute to localized pollution spikes. Winter (December-February) is often the most challenging season. Cold, stable air masses frequently settle over the Rhône Valley, creating conditions conducive to temperature inversions and trapping pollutants. The reduced solar radiation also limits the photochemical breakdown of pollutants. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should limit prolonged outdoor activity during periods of stagnant air, particularly in the mornings during autumn and winter. Monitoring local weather forecasts for indications of temperature inversions and fog is advisable.