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Xylókastro, nestled on the eastern coast of the Pelopónnisos peninsula in Greece, occupies a unique geographic position that significantly influences its air quality. Situated at approximately 38.0667° N, 22.6333° E, the town lies at the foot of Mount Parnassos, a prominent mountain range that shapes the local topography. The terrain is characterized by a steep coastal slope transitioning into the foothills, creating a funnel-like effect that can trap pollutants under certain meteorological conditions. Xylókastro’s proximity to the Corinthian Gulf is a defining feature, offering a maritime influence that generally promotes ventilation, but can also contribute to coastal fog events, potentially exacerbating air quality issues. The surrounding landscape is a blend of olive groves, citrus orchards, and pine forests, typical of the Pelopónnisos. While Xylókastro itself is a relatively small urban center, it sits within a region experiencing a gradual urban–rural gradient. To the west, agricultural lands dominate, while to the north and east, the influence of larger urban areas, including Athens (though distant), can be felt through transportation corridors. There are no major industrial belts immediately adjacent to Xylókastro, but the broader Pelopónnisos region has some industrial activity, and agricultural practices, particularly the burning of crop residues (though increasingly regulated), can contribute to localized air pollution episodes. The elevation, averaging around 100 meters above sea level, further influences air circulation patterns, potentially leading to temperature inversions during cooler months.

Xylókastro’s air quality exhibits a distinct seasonal pattern dictated by the Mediterranean climate. Summers (June-August) are typically characterized by hot, dry conditions and light winds, often leading to stagnant air and the potential for localized pollution build-up, particularly from vehicle emissions and occasional agricultural burning. The intense solar radiation promotes photochemical smog formation, though the coastal breeze usually mitigates this somewhat. Spring (March-May) and Autumn (September-November) generally offer the most favorable air quality, with moderate temperatures and more frequent wind patterns that disperse pollutants. However, autumn can also bring periods of fog, especially in October and November, which traps pollutants near the ground. Winter (December-February) presents a more complex scenario. While rainfall is more frequent, cleansing the atmosphere, cold air masses can lead to temperature inversions, where a layer of warm air sits above cooler air near the ground, preventing vertical mixing and trapping pollutants. This is particularly relevant in the mornings. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should be mindful of these conditions and limit prolonged outdoor exposure during periods of fog or temperature inversions. Agricultural activities, including the use of machinery and potential burning practices, can also impact air quality during these seasons. Overall, the shoulder seasons of spring and autumn are generally the most pleasant times for outdoor activities, while summer requires vigilance and winter demands awareness of potential inversion events.