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Loulé, nestled in the heart of the Algarve region of Portugal, occupies a geographically significant position within the Faro district. Located at approximately 37.1440° N, 8.0235° W, the city sits on a gently sloping plateau, roughly 150 meters above sea level, within the fertile Barrocal landscape – a transition zone between the coastal plains and the Serra de Monchique mountains. This location influences its microclimate and, consequently, its air quality. The surrounding landscape is a mosaic of orange groves, almond orchards, and vineyards, characteristic of the Algarve’s agricultural heartland. To the south lies the Atlantic Ocean, providing a moderating influence on temperatures and a potential pathway for maritime air masses. However, the Serra de Monchique to the north can create localized topographic effects, trapping pollutants under certain meteorological conditions, particularly during periods of calm winds. Loulé’s urban fabric is a blend of historic architecture and modern development, with a relatively low-rise profile. While not a major industrial hub, the city serves as a commercial and administrative centre for the surrounding agricultural region, leading to traffic-related emissions. The urban–rural gradient is gradual, with agricultural land seamlessly merging into the city’s periphery. The proximity to the Ria Formosa Natural Park, a lagoon system, also plays a role, potentially influencing humidity levels and the dispersion of pollutants. The prevailing winds generally blow from the west, carrying moisture and influencing the local climate, but their effectiveness in dispersing pollutants can vary depending on atmospheric stability.

Loulé’s air quality exhibits a distinct seasonal pattern dictated by the region’s Mediterranean climate. Summers (June-August) are typically hot and dry, characterized by prolonged periods of sunshine and minimal rainfall. This often leads to stagnant air conditions, particularly during heatwaves, which can exacerbate the impact of local emissions from traffic and agricultural activities. Temperature inversions, common during these months, trap pollutants near the ground, potentially increasing localized concentrations. Spring (March-May) and Autumn (September-November) generally offer improved air quality due to increased wind speeds and rainfall, which help to disperse pollutants. However, agricultural burning, a traditional practice in the region, can occasionally contribute to elevated particulate matter levels during these transitional seasons. Winters (December-February) are mild and wetter, with more frequent rainfall and stronger winds, which typically result in better air quality. Fog, however, can occasionally form in the mornings, particularly in low-lying areas, temporarily reducing visibility and trapping pollutants. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should be particularly mindful during the summer months, limiting strenuous outdoor activity during peak heat and avoiding areas with high traffic density. During agricultural burning periods, staying indoors with windows closed is advisable. The Algarve’s generally sunny climate encourages outdoor pursuits, but awareness of seasonal variations in air quality is crucial for protecting public health. The region’s reliance on tourism also means increased vehicle traffic during peak seasons, further impacting air quality.