La Garriga Air Quality Index (AQI)

Loading live AQI data...

Loading historical AQI trends...

La Garriga, nestled in the Vall del Congost region of Catalonia, Spain, presents a unique geographic setting influencing its air quality. Situated at coordinates 41.6833, 2.2833, the town occupies a valley floor at an elevation of approximately 280 meters above sea level. This valley location, while providing scenic beauty, can contribute to pollutant trapping, particularly during temperature inversions. The surrounding landscape is characterised by the Catalan Pre-Coastal Range, with forested hills rising to the north and west, and more gently sloping agricultural lands extending to the south and east. La Garriga is approximately 30km from Barcelona, placing it within the sphere of influence of that major metropolitan area’s emissions. While not directly on the coast, its proximity (around 40km) means it can experience some maritime influences. Historically, the area was known for its textile industry, though this has diminished, leaving a legacy of potential localised contamination. The urban-rural gradient is relatively sharp, transitioning quickly from the town’s built environment to agricultural fields and forested slopes. This gradient impacts dispersion patterns, with pollutants potentially accumulating in the valley bottom and being less effectively flushed out by prevailing winds. The Congost River flows nearby, offering some natural ventilation but also potentially contributing to humidity and fog formation, which can exacerbate pollution.

Air quality in La Garriga follows a distinct seasonal pattern. Winter, from December to February, often sees poorer air quality due to increased heating demands, leading to higher particulate matter (PM) concentrations from wood burning and fossil fuel combustion. Temperature inversions are common during these months, trapping pollutants near the ground. Spring, March to May, brings improving conditions as temperatures rise and rainfall increases, washing away accumulated pollutants. However, agricultural activities, including fertilizer application, can contribute to ammonia emissions. Summer, June to August, generally experiences the best air quality, aided by stronger winds and higher temperatures promoting dispersion. However, prolonged heatwaves can trigger increased ozone formation, a secondary pollutant. Autumn, September to November, sees a transition period. The return to heating, combined with agricultural harvesting, can lead to a slight deterioration in air quality. October is often a particularly challenging month. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter mornings and periods of stagnant air. Monitoring pollen levels is also crucial during spring. Avoiding peak hours near roads and industrial areas is advisable year-round. The prevailing wind direction, typically from the northwest, influences pollutant transport.