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Montornés del Vallés, nestled in the Vallès Oriental comarca of Catalonia, Spain, occupies a geographically strategic, yet potentially vulnerable, position. The city sits approximately 30km north of Barcelona, benefiting from proximity to a major economic hub, but also susceptible to its wider pollution footprint. The terrain is characterised by rolling hills and valleys, typical of the Catalan Pre-Coastal Range, with an elevation ranging around 250-350 meters. This undulating landscape influences local wind patterns, creating pockets where pollutants can accumulate. Surrounding Montornés are significant agricultural zones, particularly vineyards and farmland, alongside pockets of light industrial activity concentrated along the major transport corridors – notably the AP-7 and C-17 highways. These roads contribute significantly to localised emissions. The urban-rural gradient is relatively sharp; the city itself is a moderate-sized settlement, quickly transitioning to more open countryside. This proximity to both agricultural practices (potential ammonia emissions from livestock and fertiliser use) and transport infrastructure creates a complex interplay of factors impacting air quality. The Besòs River flows nearby, but its influence on local air circulation is limited due to the topography. The prevailing winds are generally from the northwest, potentially carrying pollutants from further inland.

Air quality in Montornés del Vallés exhibits a distinct seasonal pattern. Winter, from December to February, often sees poorer air quality due to temperature inversions trapping pollutants near the ground, combined with increased residential heating using biomass. Calm conditions exacerbate this, leading to higher concentrations of particulate matter. Spring, March to May, brings a gradual improvement as temperatures rise and rainfall increases, washing away accumulated pollutants. However, agricultural activities intensify, potentially increasing ammonia levels. Summer, June to August, typically enjoys the cleanest air, aided by prevailing winds dispersing emissions and higher boundary layer heights. However, prolonged heatwaves can trigger ozone formation, a secondary pollutant. Autumn, September to November, marks a transition period. The return to school and increased industrial activity contribute to rising emissions. October and November often experience foggy conditions, trapping pollutants and reducing visibility. Sensitive individuals – children, the elderly, and those with respiratory conditions – should be particularly cautious during winter and autumn. Avoiding strenuous outdoor activity on still, cold days is advisable. Monitoring local reports and limiting exposure during peak pollution periods is crucial for maintaining respiratory health throughout the year.