Lerum Air Quality Index (AQI)

Loading live AQI data...

Loading historical AQI trends...

Lerum, nestled within the Vastra Gotaland region of Sweden, occupies a geographically significant position just east of Gothenburg, Sweden’s second-largest city. Its coordinates (57.7667, 12.2667) place it within a gently undulating landscape characterized by a mix of forested areas, agricultural fields, and residential zones. The terrain is predominantly low-lying, with elevations rarely exceeding 150 meters above sea level, contributing to relatively stable atmospheric conditions. Lerum’s proximity to Gothenburg is crucial; while it benefits from the region’s robust infrastructure, it also experiences some degree of urban influence. The surrounding landscape is a mosaic of deciduous forests, primarily birch and oak, interspersed with arable land used for crop cultivation and livestock grazing. This agricultural activity, while generally sustainable, can occasionally contribute to localized emissions, particularly during harvest seasons. The urban–rural gradient is gradual, with Lerum exhibiting a distinct suburban character, blending residential areas with pockets of green space and light industrial activity. The Göta älv river, though not directly bordering Lerum, flows nearby, influencing local weather patterns and providing a potential pathway for pollutant dispersion. The city’s location within the southwestern Swedish coastal plain means it’s susceptible to influences from the North Sea, including maritime air masses and occasional coastal fog, which can trap pollutants under certain meteorological conditions. The regional industrial belt, centered around Gothenburg, exerts an indirect influence on Lerum’s air quality, with occasional transport of pollutants from larger industrial sources.

Lerum’s air quality follows a distinct seasonal pattern dictated by Sweden’s temperate climate. Winter months (December-February) often present the greatest challenges. Cold temperatures and frequent temperature inversions – where a layer of warm air sits above cooler air near the ground – trap pollutants, leading to periods of stagnant air and elevated concentrations of particulate matter. Fog, common during these months, exacerbates this effect by further reducing atmospheric mixing. Spring (March-May) brings a gradual improvement as temperatures rise and wind speeds increase, dispersing pollutants. Agricultural activities begin, potentially releasing ammonia from fertilizers, though this is generally localized. Summer (June-August) typically offers the best air quality, with consistent winds and higher temperatures promoting good ventilation. However, occasional heatwaves can lead to ozone formation, a secondary pollutant. Autumn (September-November) sees a return to more challenging conditions as temperatures cool and the likelihood of temperature inversions increases. Leaf fall contributes to particulate matter, and agricultural burning, though regulated, can occasionally occur. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should be particularly cautious during winter and autumn, limiting outdoor exertion on days with visibly poor air quality. During the warmer months, monitoring for ozone alerts is advisable, especially during periods of intense sunshine. Overall, Lerum’s air quality is generally good, but awareness of seasonal variations and meteorological influences is key to minimizing exposure and protecting public health.