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Badajoz, situated in the Extremadura region of Spain, occupies a strategic yet challenging geographical position. The city lies on a gently undulating plain, approximately 140 meters above sea level, within the Tagus River basin. This relatively low elevation contributes to potential air stagnation, particularly during periods of calm weather. Badajoz is bordered by extensive agricultural lands, primarily olive groves and cereal crops, which, while vital to the regional economy, can contribute to particulate matter pollution through agricultural practices and seasonal burning of crop residue. The proximity to Portugal, with the Guadiana River forming a significant portion of the border, influences wind patterns and pollutant transport. Historically, Badajoz developed as a fortified settlement, influencing its urban layout with a dense core and radiating streets. While not a major industrial hub, Badajoz benefits from transport links, including road and rail, which also introduce emissions. The urban-rural gradient is relatively sharp, transitioning quickly from the city’s built environment to the expansive agricultural landscape. This proximity means Badajoz’s air quality is susceptible to both local emissions and regional transport of pollutants, making understanding prevailing winds crucial for mitigation strategies. The climate is Mediterranean, characterised by hot, dry summers and mild, wet winters, impacting pollutant dispersion.

Badajoz experiences a distinct seasonal air quality narrative. Summers (June-August) often see elevated ozone levels due to intense sunlight and high temperatures reacting with nitrogen oxides from vehicle emissions. While winds can offer some relief, prolonged heatwaves can lead to stagnant air and increased concentrations of ground-level ozone. Autumn (September-November) brings a shift, with increased particulate matter from agricultural burning as farmers prepare fields for winter planting. Rainfall begins to increase, offering some natural cleansing, but temperature inversions can trap pollutants near the ground. Winters (December-February) are generally the period of best air quality, with increased precipitation washing away pollutants and stronger winds aiding dispersion. However, wood burning for heating can locally elevate particulate matter. Spring (March-May) is a transitional period, with fluctuating conditions. Pollen counts are high, impacting respiratory health, and agricultural activity resumes, contributing to particulate matter. March and April can be particularly challenging. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during peak ozone periods in summer and periods of agricultural burning in autumn. Monitoring wind direction and avoiding activity near busy roads is advisable year-round.