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Canovellas, nestled in Catalonia, Spain, occupies a geographically significant position within the Vallès Oriental region, a historically industrial and increasingly suburban zone. Located approximately 20 kilometers northeast of Barcelona, its coordinates (41.6203, 2.2847) place it at an elevation of roughly 550 meters above sea level, contributing to a cooler microclimate compared to the coastal metropolis. The surrounding landscape is a blend of gently sloping hills and valleys, characteristic of the pre-Pyrenean terrain. To the west, the urban sprawl of Barcelona gradually transitions into agricultural land, primarily vineyards and olive groves, while eastward, the terrain rises towards the Serra de les Caves, a range of low mountains. This proximity to both urban and agricultural zones presents a complex interplay of pollution sources. The Vallès Oriental has historically been an industrial belt, with a concentration of manufacturing and light industry, though this has shifted somewhat in recent decades. The urban–rural gradient is relatively sharp, with Canovellas exhibiting a distinct suburban character, experiencing the effects of both urban emissions and agricultural practices. The town’s location within a valley can exacerbate air quality issues, particularly during periods of temperature inversion, as cool, dense air settles and traps pollutants. The relatively limited ventilation within the valley further compounds this effect. The nearby Ripoll River, while not directly adjacent, influences local humidity and can impact the dispersion of particulate matter. Overall, Canovellas’ geography creates a setting where local emissions combine with regional pollution, demanding careful air quality management.

Canovellas experiences a Mediterranean climate, significantly influencing its air quality throughout the year. Spring (March-May) generally sees improved conditions as winds increase and temperatures rise, dispersing accumulated winter pollutants. However, agricultural activities, including the use of machinery and fertilizers, can contribute to localized emissions. Summer (June-August) is typically drier and warmer, often leading to stagnant air conditions, especially during heatwaves. Temperature inversions are less frequent but can still occur, trapping pollutants released from industry and nearby urban areas. The intense solar radiation can also contribute to photochemical smog formation. Autumn (September-November) presents a mixed picture. While winds are generally favorable, agricultural burning, a traditional practice in some areas, can significantly degrade air quality during this period. The transition from warmer to cooler temperatures can also lead to localized fog, trapping pollutants near ground level. Winter (December-February) is often the most challenging season. Cold, stable air masses frequently lead to prolonged temperature inversions, trapping pollutants and creating a layer of stagnant air. Reduced wind speeds further exacerbate this issue. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor activity during periods of stagnant air, particularly in the mornings when inversions are most pronounced. It’s advisable to monitor local air quality reports and avoid strenuous outdoor exercise when conditions are unfavorable. Increased ventilation in homes and workplaces is also recommended during these periods. The agricultural cycle, with its associated emissions, requires careful management to minimize its impact on air quality throughout the year.