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Mongat, nestled in the heart of Catalonia, Spain, occupies a geographically significant position within the Baix Llobregat region, just southwest of Barcelona. Its coordinates (41.4690, 2.2805) place it on a gently sloping plain, part of the wider Catalan Coastal Strip, characterized by alluvial soils deposited by the Llobregat River. The terrain is relatively flat, facilitating urban development and agricultural practices, with a modest elevation averaging around 80 meters above sea level. This proximity to the Mediterranean Sea influences local weather patterns and, crucially, air quality. To the east lies the sprawling urban expanse of Barcelona, a major industrial and transportation hub, creating a significant urban–rural gradient. Mongat itself is a primarily residential community, experiencing a gradual transition from urban to agricultural land as one moves westward, with vineyards and olive groves dominating the landscape. The Llobregat River, flowing nearby, provides a natural drainage pathway but can also contribute to localized humidity and fog formation, impacting pollutant dispersion. The surrounding landscape is a mix of cultivated fields, scattered woodlands, and the distant Serra de Collserola mountain range, which can act as a barrier to wind flow, potentially trapping pollutants under certain meteorological conditions. The region’s history of agriculture, combined with Barcelona’s industrial footprint, shapes the air quality challenges faced by Mongat, demanding careful monitoring and mitigation strategies.

Mongat’s air quality experiences a distinct seasonal rhythm dictated by Mediterranean climate patterns. Summers (June-August) are typically hot and dry, characterized by stagnant air masses and frequent high-pressure systems. This often leads to temperature inversions, where a layer of warm air traps cooler air near the ground, preventing the vertical dispersion of pollutants. Agricultural activities, including harvesting and the use of machinery, can also contribute to particulate matter during this period. Autumn (September-November) brings a gradual shift, with increased rainfall and more frequent wind events, which help to flush out accumulated pollutants, generally improving air quality. Winter (December-February) can be variable; while rainfall is more common, periods of cold, calm weather can trigger localized pollution episodes, particularly from residential heating and traffic. Fog, common during these months, further restricts pollutant dispersal. Spring (March-May) sees a return to more stable weather patterns, with a mix of sunshine and occasional rainfall. The blossoming of local flora releases pollen, which can exacerbate respiratory issues for sensitive individuals. Outdoor activity is generally favoured during spring and autumn, with summer requiring caution during stagnant periods and winter demanding awareness of potential cold-weather pollution spikes. Sensitive groups, including children, the elderly, and those with pre-existing respiratory conditions, should monitor local air quality reports and limit outdoor exposure during periods of elevated pollution, particularly during the summer months when inversions are more likely.