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Kuressaare, the capital of Saaremaa Island in Estonia, occupies a unique geographic position profoundly influencing its air quality. Situated on the southern coast of the island at coordinates 58.2500, 22.4833, the city benefits from a coastal location within the Baltic Sea region. Saaremaa itself is the largest island in Estonia, characterized by a gently undulating terrain shaped by glacial activity during the Pleistocene epoch. The island’s landscape is a mosaic of forests, meadows, and coastal plains, with the highest elevations found in the central region. Kuressaare’s immediate surroundings are predominantly low-lying, transitioning from urban areas to agricultural land and then to the dense pine forests that dominate much of Saaremaa. The Baltic Sea exerts a significant moderating influence on the local climate and air circulation patterns. Prevailing westerly winds bring maritime air masses, often dispersing pollutants. However, during periods of calm, particularly in the autumn and winter, these winds can weaken, leading to localized stagnation. The island’s relative isolation, far from major industrial belts, contributes to generally cleaner air compared to mainland Estonia. Agricultural activities, primarily focused on livestock farming and grain production, are present in the surrounding rural areas, potentially contributing to ammonia emissions, though these are typically localized. The urban–rural gradient around Kuressaare is gradual, with small villages and agricultural fields interspersed throughout the island, minimizing abrupt shifts in land use and pollution sources. The city’s elevation, relatively low and close to sea level, can exacerbate the effects of temperature inversions, trapping pollutants near the ground.

Kuressaare’s air quality exhibits a distinct seasonal pattern dictated by meteorological conditions. Summer, from June to August, generally boasts the best air quality. Strong, consistent westerly winds sweep across the Baltic Sea, effectively dispersing any potential pollutants. Temperatures are moderate, and rainfall is relatively frequent, further aiding in pollutant removal. This period is ideal for outdoor activities, with minimal concerns for air quality-sensitive individuals. Autumn, September and October, marks a transition period. As temperatures cool and wind speeds decrease, the risk of localized pollution episodes increases. Temperature inversions, where a layer of warm air traps cooler air near the ground, become more common, particularly during calm, clear nights. This can lead to a build-up of pollutants from local sources. Winter, November to March, presents the greatest air quality challenges. Cold temperatures, frequent fog, and prolonged periods of calm weather contribute to stagnant air conditions. While industrial emissions are minimal, residential heating using wood or other biomass fuels can contribute to particulate matter pollution. The lack of wind and the prevalence of fog further exacerbate this issue. Spring, April and May, sees a gradual improvement as temperatures rise and wind speeds increase. Rainfall also becomes more frequent, washing away accumulated pollutants. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should exercise caution during autumn and winter months, particularly on days with fog or temperature inversions. Limiting prolonged outdoor exposure and avoiding strenuous activity during these periods is advisable.