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Auxerre, nestled in the heart of the Bourgogne-Franche-Comté region of France, occupies a geographically significant position within the Yonne department. Situated on the banks of the Yonne River, a tributary of the Seine, the city’s urban fabric is intimately linked to this waterway, historically vital for trade and transport. The terrain surrounding Auxerre is characterized by gently rolling hills, part of the larger Burgundy landscape, transitioning from fluvial plains to the slopes of the Morvan hills to the west. This undulating topography influences local wind patterns, sometimes trapping pollutants within the valley during periods of calm weather. The city’s elevation, averaging around 70 meters above sea level, contributes to a relatively stable atmospheric layer, which can exacerbate pollution episodes. While Auxerre isn't directly adjacent to major industrial belts, it lies within a region known for its agricultural activity, particularly viticulture. The surrounding vineyards, while aesthetically pleasing, can contribute to particulate matter emissions during harvesting and soil preparation. The urban–rural gradient around Auxerre is gradual, with smaller villages and agricultural land seamlessly blending into the city’s periphery. This proximity to agricultural zones means that seasonal agricultural practices, such as the use of fertilizers and pesticides, can occasionally impact local air quality. The Yonne River itself, while generally clean, can experience localized pollution from agricultural runoff, further impacting the overall air quality profile of the city.

Auxerre’s air quality experiences a distinct seasonal rhythm dictated by its temperate climate and regional weather patterns. Spring (March-May) often brings a noticeable improvement, as increased rainfall helps to cleanse the atmosphere and stronger winds disperse accumulated pollutants. However, pollen levels rise significantly, impacting those with respiratory sensitivities. Summer (June-August) typically sees relatively good air quality, with consistent breezes and higher temperatures promoting dispersion. The risk of localized heatwaves, however, can lead to stagnant air and increased ozone formation. Autumn (September-November) presents a more complex picture. While generally pleasant, this period often witnesses a rise in particulate matter due to agricultural activities – harvesting, tilling, and the burning of crop residues – combined with cooler temperatures and less frequent wind. Fog, common in October and November, can trap pollutants near ground level, creating localized episodes of reduced visibility and potentially impacting respiratory health. Winter (December-February) is often the most challenging season. Temperature inversions, where a layer of warm air sits above cooler air near the ground, are frequent, preventing vertical mixing and trapping pollutants. Cold, still days are particularly problematic. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should limit prolonged outdoor exposure during these periods. During the autumn and winter months, it’s advisable to avoid strenuous outdoor activity on days with low visibility or a noticeable smell of smoke.