Uppsala Air Quality Index (AQI)

Loading live AQI data...

Loading historical AQI trends...

Uppsala, situated in the eastern central part of Sweden within the Stockholm County, occupies a gently undulating landscape bordering the Mälaren lake basin. Its coordinates, 59.8601° N, 17.6400° E, place it within a temperate continental climate zone, influenced by both maritime and continental air masses. The city is built on a moraine ridge, offering slightly elevated terrain compared to the surrounding plains, a feature impacting local wind patterns and pollutant dispersion. Historically, Uppsala’s growth was tied to its position as a trade and religious centre, benefitting from access to waterways for transport. While largely a university and administrative city today, the surrounding region features a mix of agricultural land – primarily arable farming – and forested areas. The urban-rural gradient is relatively sharp, with significant agricultural activity immediately surrounding the city. Industrial activity is concentrated further south towards Stockholm, but regional transport corridors contribute to background pollution levels. The proximity to Mälaren, Sweden’s third-largest lake, can occasionally lead to temperature inversions, trapping pollutants during calm weather conditions, particularly in winter. The prevailing winds are generally from the west, carrying pollutants from more industrialised areas of Sweden and occasionally from continental Europe. This geographical setting dictates Uppsala’s unique air quality challenges.

Uppsala’s air quality follows a distinct seasonal pattern. Winter, from November to February, typically sees the poorest air quality. Reduced sunlight hours and stable, cold air masses create temperature inversions, trapping particulate matter (PM) from wood burning – a common heating source – and vehicle emissions. Snow cover also reflects pollutants, increasing ground-level concentrations. Spring, March to May, brings gradual improvement as temperatures rise and winds become more frequent, dispersing pollutants. However, agricultural activities, such as fertilisation, can contribute to ammonia levels. Summer, June to August, generally offers the cleanest air, with prevailing winds and higher temperatures promoting dispersion. Ozone formation can be a concern on hot, sunny days, particularly downwind of urban areas. Autumn, September to October, sees a return to poorer conditions as heating demand increases and atmospheric stability returns. Fog, common during autumn mornings, can exacerbate particulate matter concentrations. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and autumn mornings. Monitoring pollen levels is also crucial during spring and summer. Avoiding peak traffic hours and choosing active transport when possible can further mitigate exposure.