Salt Air Quality Index (AQI)

Loading live AQI data...

Loading weather snapshot...

Loading historical AQI trends...

Salt, Catalonia, nestled in the Baix Llobregat region of Spain, occupies a geographically significant position within the metropolitan area of Barcelona. Located approximately 25 kilometers west of the city center, Salt’s terrain is characterized by a gently sloping plain, transitioning from the coastal foothills of the Serra de Collserola to the Llobregat River valley. The river itself plays a crucial role, acting as a natural drainage channel and influencing local microclimates. The surrounding landscape is a blend of agricultural land – primarily vineyards and orchards – and increasingly, suburban development, creating a distinct urban–rural gradient. The proximity to Barcelona, a major industrial and transportation hub, inevitably impacts Salt’s air quality. While Salt itself doesn't host heavy industry, it's situated downwind of Barcelona's industrial belts and experiences traffic-related emissions. The Serra de Collserola range to the east provides some shielding from prevailing winds originating from the Mediterranean Sea, but also contributes to localized temperature inversions, particularly during cooler months. Elevation varies slightly, generally ranging from 15 to 30 meters above sea level. The relatively flat topography, combined with the river valley, can trap pollutants, especially when wind speeds are low. The agricultural zones surrounding Salt contribute to seasonal particulate matter, particularly during harvesting and tillage periods, adding another layer of complexity to the city’s air quality profile. The Mediterranean climate, with its warm, dry summers and mild, wet winters, further influences atmospheric conditions and pollutant dispersion.

Salt’s air quality follows a distinct seasonal pattern dictated by its Mediterranean climate and regional meteorological influences. Summers (June-August) are typically characterized by high temperatures and prolonged periods of calm winds, frequently leading to temperature inversions. These inversions trap pollutants close to the ground, resulting in a noticeable increase in particulate matter and ozone concentrations. The dry conditions exacerbate this, as there is minimal precipitation to wash pollutants from the atmosphere. Spring (March-May) and Autumn (September-November) generally offer improved air quality, with more frequent wind events dispersing pollutants. However, autumn can see a rise in agricultural burning, contributing to localized particulate matter spikes. Winters (December-February) are the most challenging period. While rainfall is more frequent, cold, stable air masses often settle over the region, creating persistent temperature inversions and trapping emissions from Barcelona and surrounding areas. Fog, common during these months, further reduces visibility and concentrates pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during these periods, particularly on days with stagnant air. During the summer months, avoiding strenuous activity during peak sunlight hours is advisable. Throughout the year, monitoring local air quality reports and adhering to public health advisories is crucial for minimizing exposure and protecting respiratory health. The Llobregat River's influence can sometimes lead to localized humidity, which can affect the perception of air quality, even if pollutant levels remain relatively stable.