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Velilla de San Antonio, nestled in the Community of Madrid, Spain, occupies a unique geographic position within the broader Iberian landscape. Situated at coordinates 40.3667, -3.4833, the municipality lies on the southern slopes of the Sierra de Guadarrama mountain range, at an elevation of approximately 820 meters. This elevation significantly influences local weather patterns and, consequently, air quality. The surrounding terrain is characterised by rolling hills transitioning into the more rugged mountainous areas to the north. The Manzanares River, though not immediately adjacent, exerts a hydrological influence on the region. While Velilla de San Antonio is primarily a residential area, its proximity to the larger metropolitan area of Madrid introduces potential for pollutant transport. The urban-rural gradient is relatively sharp; the town itself maintains a semi-rural character, but is increasingly influenced by suburban sprawl. Agricultural land surrounds the town, with some small-scale industrial activity concentrated along major transport routes connecting Madrid to the south. The prevailing winds, generally from the northwest, can carry pollutants from Madrid, impacting Velilla’s air quality, particularly during periods of low atmospheric mixing. The topography funnels these winds, potentially exacerbating pollutant concentrations.

Velilla de San Antonio experiences a Mediterranean climate with marked seasonal variations in air quality. Winters (December-February) often see poorer air quality due to temperature inversions trapping pollutants near the ground, combined with increased heating demands leading to greater emissions from residential sources. Calm, clear conditions exacerbate this. Spring (March-May) brings improving conditions as temperatures rise and winds become more frequent, dispersing pollutants. However, agricultural activities can contribute to particulate matter. Summers (June-August) generally offer the best air quality, with strong winds and infrequent rainfall effectively flushing out pollutants. However, ozone formation can be a concern during prolonged periods of intense sunlight and high temperatures. Autumn (September-November) sees a transition period. Increased rainfall helps clear the air initially, but the return of heating systems and potential for stagnant air masses can lead to declining air quality. Sensitive individuals, such as those with respiratory conditions, should be particularly cautious during winter and autumn. Months to favour for outdoor activity are June, July, and August. Fog, common in the cooler months, can trap pollutants and reduce visibility, further impacting air quality. Monitoring wind direction is crucial, as pollutants from Madrid can significantly affect local conditions.