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Reims, situated in the Grand Est region of France, occupies a geographically significant position within the Champagne-Ardenne historical province. Its coordinates (49.2628, 4.0347) place it in a gently undulating landscape, characterized by the rolling hills of the Champagne region, famed for its vineyards. The city itself sits at an average elevation of approximately 130 meters (427 feet) above sea level, contributing to localized microclimates and influencing air circulation patterns. Reims is nestled along the banks of the Petite Champagne river, a tributary of the Marne, providing a moderate influence on humidity and temperature. The surrounding landscape is predominantly agricultural, with extensive vineyards dominating the immediate vicinity, interspersed with pockets of deciduous forest. Further afield, the terrain gradually rises towards the Argonne Forest to the east. Historically, the area has seen industrial activity, though it’s less pronounced than in some other French cities; light manufacturing and food processing remain present. The urban–rural gradient around Reims is relatively smooth, with smaller towns and villages blending seamlessly into the agricultural landscape. This proximity to agricultural land, while contributing to the region’s economic vitality, can also introduce localized sources of air pollution, particularly during harvest seasons and periods of intensive fertilizer application. The city’s location within a broad river valley can sometimes trap pollutants, especially during periods of calm weather, impacting local air quality. The prevailing westerly winds generally help to disperse pollutants, but inversions can occasionally lead to stagnation.

Reims experiences a temperate climate with distinct seasonal variations that significantly impact air quality. Spring (March-May) typically sees a gradual improvement as temperatures rise and winds increase, dispersing accumulated winter pollutants. However, agricultural activities, including the spreading of fertilizers and pesticides, can introduce localized spikes in ammonia and particulate matter. Summer (June-August) generally offers the best air quality, with consistent winds and higher temperatures promoting dispersion. Heatwaves, though, can lead to ozone formation, a secondary pollutant, particularly during stagnant periods. Autumn (September-November) presents a more complex picture. While winds remain relatively frequent, the harvest season intensifies agricultural emissions, and the cooler temperatures can lead to increased biomass burning in rural areas, contributing to particulate pollution. Fog, common in autumn mornings, traps pollutants close to the ground. Winter (December-February) often witnesses the poorest air quality. Cold, stable air masses frequently lead to temperature inversions, where a layer of warm air sits above cooler air near the ground, preventing vertical mixing and trapping pollutants. Residential heating, primarily using natural gas and wood, contributes significantly to particulate matter and nitrogen dioxide levels. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during prolonged periods of fog or temperature inversions, particularly in the mornings. During harvest periods, residents living near agricultural fields should be mindful of potential exposure to pesticides and fertilizers. Overall, spring and autumn require heightened awareness, while summer generally offers the most favourable conditions for outdoor activities.