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Finspång, nestled in the Östergötland county of Sweden, occupies a geographically significant position within the country’s industrial heartland. Located at approximately 58.72° N, 15.78° E, the town’s terrain is characterized by gently rolling hills and valleys carved by glacial activity during the last ice age. The surrounding landscape is a blend of agricultural fields, primarily used for cereal and livestock farming, and extensive coniferous forests, typical of the Swedish landscape. The city sits near the expansive Göta Canal, a vital waterway historically and currently used for both commercial and recreational purposes, influencing local microclimates and providing a corridor for potential pollutant transport. Finspång’s elevation averages around 130 meters above sea level, contributing to localized temperature inversions, particularly during colder months. Historically, Finspång’s development is intrinsically linked to the iron and steel industry, with the expansive industrial area dominating the eastern part of the town. This legacy continues to shape the urban fabric, creating a distinct urban–rural gradient where industrial zones transition into residential areas and then into the surrounding agricultural and forested landscapes. The proximity to the industrial belt, combined with the relatively sheltered topography, can influence local air quality patterns, potentially trapping pollutants under certain meteorological conditions. The Göta Canal’s influence extends beyond transportation, impacting humidity levels and influencing wind patterns, which are crucial in dispersing or concentrating airborne particles.

Finspång’s air quality experiences a distinct seasonal cycle heavily influenced by its climate and industrial heritage. Winter, spanning roughly November to March, often presents the most challenging conditions. Cold temperatures and frequent temperature inversions, where a layer of warm air traps cooler air near the ground, lead to pollutant accumulation. Reduced solar radiation and limited wind speeds during this period exacerbate the problem, hindering the natural dispersion of emissions from the steel industry and residential heating. Fog, common in winter, further traps pollutants, creating localized pockets of poor air quality. Spring (April-May) brings a gradual improvement as temperatures rise, and wind speeds increase, aiding in pollutant dispersal. However, agricultural activities, such as fertilizer application, can contribute to ammonia emissions. Summer (June-August) generally offers the best air quality, with consistent winds and ample sunlight facilitating efficient pollutant removal. However, occasional heatwaves can lead to stagnant air conditions. Autumn (September-October) sees a transition period, with decreasing temperatures and increasing humidity, potentially leading to a resurgence of localized pollution episodes, particularly during periods of calm weather. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months, limiting prolonged outdoor exposure and avoiding areas near industrial sources. During spring, awareness of agricultural emissions is advised. Overall, the months of July and August typically offer the most favourable conditions for outdoor activities.