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Santomera, nestled in the heart of the Region of Murcia, Spain, occupies a geographically significant position within the Campo de Cartagena, a fertile plain sculpted by alluvial deposits from the Sierra Minera mountain range to the west. Located at approximately 38.06°N, 1.05°W, and with an elevation of around 17 meters above sea level, Santomera benefits from a relatively flat terrain, which, while advantageous for agriculture, can also contribute to localized air quality challenges. The city’s proximity to the Mar Menor, a hypersaline lagoon, plays a complex role; while offering a coastal breeze, it can also trap pollutants under certain meteorological conditions. The surrounding landscape is dominated by intensive agricultural land, particularly citrus groves and vegetable farms, a major economic driver for the region. This agricultural activity, coupled with the presence of industrial zones further east towards Cartagena, creates a distinct urban-rural gradient. Santomera itself exhibits a typical Mediterranean urban character, with a compact historic center radiating outwards into newer residential areas. The Sierra Minera, rich in mineral deposits, influences local wind patterns, occasionally channeling breezes that can either disperse or concentrate pollutants. The Campo de Cartagena’s industrial belt, including cement plants and processing facilities, represents a potential source of airborne particulate matter, impacting Santomera’s air quality, particularly during periods of stagnant air. The relatively low elevation and flat topography limit vertical mixing, potentially exacerbating ground-level pollution.

Santomera’s air quality follows a distinct seasonal pattern dictated by the Mediterranean climate. Summers (July-August) are typically hot and dry, characterized by prolonged periods of sunshine and minimal rainfall. This often leads to temperature inversions, where a layer of warm air traps cooler air near the ground, preventing the vertical dispersion of pollutants. Agricultural activities, including irrigation and the use of machinery, contribute to particulate matter and ammonia emissions during these months. Spring (April-May) and Autumn (September-October) generally offer the most favourable air quality, with moderate temperatures and more frequent rainfall, which naturally cleanses the atmosphere. However, agricultural burning, a traditional practice in the region, can occasionally lead to spikes in particulate pollution during these transitional periods. Winters (November-March) are cooler and wetter, with occasional episodes of fog, which can trap pollutants and reduce visibility. The Mar Menor’s influence is most pronounced during winter, as stagnant air and fog events can concentrate pollutants near the lagoon. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during summer months and periods of agricultural burning. Outdoor activities are generally best enjoyed during spring and autumn, avoiding peak agricultural activity times. While winter brings cooler temperatures, the potential for fog and trapped pollutants warrants vigilance, particularly during prolonged periods of calm weather. Maintaining awareness of local weather forecasts and agricultural practices is crucial for minimizing exposure to potential air quality impacts.