This week, a thick haze has settled over the Barcelona metropolitan area, significantly reducing visibility. This is due to a potent combination of persistent fog, trapped pollutants, and an approaching plume of Saharan dust. A stubborn anticyclone, a high-pressure weather system, is the culprit, bringing stable, spring-like temperatures alongside atmospheric stagnation.
Your browser does not support the video tag.
This weather phenomenon recently brought unseasonably warm conditions, as detailed in a recent Barna.News report. It creates a lid-like effect on the atmosphere, trapping moisture and airborne particles close to the ground due to the lack of wind. This has led to the current murky conditions that shroud the city’s iconic skyline.
A Confluence of Atmospheric Conditions
Three distinct factors are working in concert to reduce visibility. Firstly, dense banks of fog have become a daily feature, especially along the coast and in low-lying areas like the Besòs river basin and parts of the Vallès plain. According to a Betevé forecast, the fog typically forms in the evenings and early mornings. It then lifts as the day warms up, only to return as low clouds roll in from the sea in the late afternoon, particularly affecting the Maresme coast.
Secondly, stagnant air exacerbates urban pollution. Without wind to disperse emissions, traffic and industry pollutants become concentrated, contributing to smog. Air quality levels across the city are closely monitored; public data is available from sources like the Open Data BCN portal. These events highlight the city’s ongoing air quality challenges, which initiatives like expanding low-emission zones and introducing more electric buses aim to address.
Adding to this mix, a significant influx of Saharan dust is set to arrive over the weekend. A weather disturbance near the Canary Islands is forecast to push a plume of fine particulate matter northwards across the Mediterranean. Such dust events, tracked by services like Spain’s national weather agency AEMET, can turn skies an orange-brown hue, further reducing visibility and impacting air quality.
A Gloomy Weekend Ahead
This combination of elements points towards a particularly cloudy and hazy weekend for Barcelona. The Servei Meteorològic de Catalunya (Meteocat) predicts that Saharan dust, combined with an upper-level trough and persistent sea fog, will result in very few hours of direct sunlight.
This thick blanket of cloud and dust is expected to cause a slight but noticeable drop in temperatures. Maximums along the coast will struggle to surpass 15°C. However, inland areas in the pre-litoral region may see temperatures climb closer to 20°C where the haze is less dense. A persistent onshore wind will also increase humidity levels across the region.
Meteorologists suggest this complex, humid setup could prelude a more significant weather change. The accumulated moisture and atmospheric instability may lead to a spell of rain early next week, which would finally help clear the air and improve visibility across Catalonia.
