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Montijo, nestled in the heart of Extremadura, Spain, occupies a geographically significant position within the Guadiana River Valley. Its coordinates (38.9100, -6.6175) place it on relatively flat terrain, averaging around 250 meters above sea level, characteristic of the wider Extremaduran landscape. The city’s urban character is distinctly provincial, a blend of historic architecture and modern development, reflecting its role as a regional service centre. Surrounded by a predominantly agricultural landscape – olive groves, cereal fields, and vineyards dominate the surrounding plains – Montijo’s air quality is intrinsically linked to rural activities. To the west, the landscape gradually transitions into the more undulating terrain of the Sierra de Santa Cruz, influencing local wind patterns. The Guadiana River, though not directly adjacent to the city centre, plays a crucial role in the regional climate and can impact humidity levels, which in turn affect pollutant dispersion. Montijo’s location within the broader Extremadura region, a historically sparsely populated area, means it’s less exposed to the intense industrial belts found in larger Spanish cities. However, agricultural practices, particularly the use of machinery and fertilizers, contribute to localized emissions. The urban-rural gradient is relatively smooth, with smaller villages and agricultural holdings interspersed throughout the surrounding countryside, creating a diffuse pattern of human activity and potential pollution sources. The relatively flat topography can exacerbate pollutant accumulation under certain meteorological conditions, hindering effective dispersion.

Montijo’s air quality experiences a distinct seasonal cycle dictated by Extremadura’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 trap pollutants near the ground. Temperature inversions, common during these months, further exacerbate this issue, preventing vertical mixing and concentrating emissions. Spring (March-May) and Autumn (September-November) generally offer improved air quality, with more frequent rainfall and moderate temperatures promoting pollutant dispersion. However, agricultural burning, a traditional practice in the region, can significantly impact air quality during these transitional periods, especially in April and October. Winters (December-February) are cooler and wetter, with occasional fog, which can also trap pollutants, though the lower temperatures generally reduce emissions from certain sources. The prevailing winds, typically from the west, play a crucial role in transporting pollutants, and their strength and direction can vary considerably throughout the year. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the hot, dry summer months and be mindful of potential agricultural burning events in spring and autumn. Maintaining indoor air quality through ventilation and air purification can be beneficial during periods of elevated pollution.