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Malmö, Sweden's third-largest city, occupies a distinctive geographic position at the southwestern tip of the Scandinavian Peninsula, where the Öresund Strait narrows to just 4 kilometers separating Sweden from Denmark. This coastal location on the Baltic Sea's western shore fundamentally shapes Malmö's urban character and air quality dynamics. The city sits on flat, low-lying terrain with an average elevation of just 20 meters above sea level, creating a landscape where urban development blends gradually into the fertile agricultural plains of Skåne County—Sweden's breadbasket. Malmö's geography creates a unique urban-rural gradient where dense urban cores transition to suburban areas and then to extensive farmlands, with industrial zones concentrated primarily in the eastern and northern districts near the port. The Öresund Bridge, connecting Malmö to Copenhagen, anchors a transnational metropolitan region that influences transportation patterns and regional pollution dispersion. Proximity to the Baltic Sea moderates temperatures but also introduces marine aerosols, while the flat topography allows winds to sweep across the city relatively unimpeded, typically preventing prolonged pollution buildup. However, the surrounding agricultural activities in Skåne can contribute particulate matter during planting and harvesting seasons, and the urban heat island effect in dense areas like Västra Hamnen or Möllevången can occasionally trap pollutants during calm weather conditions. Malmö's position at the narrowest point of the Öresund creates a funnel effect that sometimes concentrates maritime emissions, particularly from shipping traffic in this busy international waterway.

Malmö's air quality follows a distinct seasonal pattern shaped by its maritime climate and urban activities. During winter (December-February), cold temperatures increase residential heating demand, leading to elevated particulate matter from combustion sources, particularly during temperature inversions that occasionally trap pollutants in the low-lying terrain. February typically sees the poorest air quality as stagnant conditions combine with heating emissions. Spring (March-May) brings improvement as increasing winds from the Baltic Sea disperse pollutants, though agricultural activities in surrounding Skåne can contribute dust and ammonia compounds during planting season. Summer (June-August) offers the cleanest air with frequent westerly winds from the North Sea, low heating demand, and minimal industrial stagnation—July is particularly favorable for outdoor activities. However, occasional heatwaves can increase ground-level ozone formation, especially in urban areas with heavy traffic. Autumn (September-November) sees gradual deterioration as temperatures drop and heating resumes, with October often marked by increased particulate matter from agricultural burning and decomposing vegetation. Sensitive groups—including those with respiratory conditions, children, and the elderly—should monitor air quality forecasts most carefully during winter inversion periods and late autumn. The city's coastal winds generally prevent prolonged pollution episodes, but vulnerable populations may experience heightened symptoms during February's coldest weeks and October's agricultural transition period. Outdoor exercise is best scheduled for summer mornings when ozone levels are lowest and wind dispersion is optimal.