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Miranda de Ebro, nestled in the province of Burgos within the autonomous community of Castile and León, Spain, occupies a strategically important position in the Iberian Peninsula. The city is situated at an elevation of approximately 695 meters (2,280 feet) above sea level, straddling the Ebro River valley. This location, at the confluence of the Ebro and Zadorra rivers, has historically made it a crucial transport hub. The surrounding landscape is characterised by rolling hills and plateaus, typical of the northern Meseta Central. To the north, the Cantabrian Mountains rise, creating a natural barrier and influencing local weather patterns. While not directly adjacent to a major industrial belt, Miranda de Ebro benefits from, and is somewhat impacted by, the industrial activity concentrated in the Basque Country to the north and the larger industrial corridors around Vitoria-Gasteiz. The surrounding agricultural zones, primarily dedicated to cereal crops and vineyards, contribute to seasonal particulate matter from farming activities. The urban-rural gradient is relatively sharp, with agricultural land quickly giving way to more densely populated areas as one approaches the city centre. This geographical setting, combined with prevailing wind patterns, significantly influences the dispersion and concentration of air pollutants within the municipality.

Air quality in Miranda de Ebro exhibits a distinct seasonal rhythm. Winter, from December to February, often sees the poorest air quality due to temperature inversions trapping pollutants from heating systems – primarily wood burning and fossil fuels – close to the ground. Calm wind conditions exacerbate this, leading to higher concentrations of particulate matter (PM2.5 and PM10). Spring, though bringing milder temperatures, can experience increased pollen counts, impacting respiratory health. Summer, typically drier with more consistent winds, generally offers the best air quality, dispersing pollutants effectively. However, heatwaves can contribute to ozone formation. Autumn, from September to November, presents a transitional period. Agricultural burning of crop residue becomes more common, leading to spikes in particulate matter. October and November are often the months with the most noticeable decline in air quality. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during winter and autumn. Monitoring wind direction is crucial; winds from the north can bring pollutants from industrial areas. Avoiding peak heating hours in winter and being mindful of pollen forecasts in spring are also recommended.