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Gothenburg, Sweden's second-largest city, occupies a strategic position on the country's west coast at the mouth of the Göta River where it meets the Kattegat strait. This coastal location creates a distinctive urban geography where maritime influences constantly interact with terrestrial systems. The city sits on relatively flat terrain with an average elevation of just 12 meters above sea level, though it's surrounded by rolling hills to the east that gradually rise toward the Scandinavian Mountains. Gothenburg's urban core is built around an extensive network of canals and waterways, with the Göta River dividing the city and creating natural harbors that have historically driven its development as a major port. The city forms the heart of the Västra Götaland region, positioned within Sweden's primary industrial belt that stretches along the coast. This industrial character is reinforced by the presence of major manufacturing facilities like the Volvo factories and the sprawling port complex, which together create concentrated emission zones. The urban-rural gradient shows dense development along the coast and riverbanks, transitioning to suburban areas and then to forested and agricultural zones inland. Gothenburg's specific geography significantly impacts air quality through several mechanisms: its low elevation and coastal position can trap pollutants under temperature inversions, maritime winds sometimes disperse emissions but can also bring ship pollution ashore, and the river valley can channel air masses in ways that concentrate vehicle and industrial emissions. The surrounding water bodies create microclimates that influence pollution dispersion patterns, while the city's position as a transportation hub ensures constant vehicle emissions from both road and maritime traffic.

Gothenburg's air quality follows a distinct seasonal pattern shaped by its humid continental climate and specific pollution sources. During winter months from November through February, air pollution reaches its peak due to a combination of meteorological factors and human activities. Cold temperatures increase residential heating emissions, while temperature inversions frequently trap pollutants close to the ground in the city's river valley. Heavy snowfall leads to road sanding and salting, and studded winter tyres generate significant road dust that becomes suspended in the air. These months also experience reduced daylight and lower wind speeds, allowing pollutants to accumulate. Sensitive groups should limit prolonged outdoor exposure during winter, especially on calm, cold days when inversion conditions are most likely. Spring brings gradual improvement as temperatures rise and precipitation increases, washing pollutants from the air. However, March and April can still experience pollution episodes from road dust as winter debris is cleared. Summer offers the cleanest air with longer daylight hours, stronger winds from the Kattegat that disperse emissions, and reduced heating needs. Maritime activities increase but are offset by better dispersion conditions. Autumn sees a gradual deterioration as temperatures drop and heating emissions rise again, with October often marking the transition toward winter pollution patterns. Fog becomes more common in autumn and can combine with pollutants to reduce visibility and air quality. For those planning outdoor activities, summer provides the most favorable conditions, while winter requires careful timing around weather forecasts and pollution advisories.