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Peristéri, nestled within the Attikí region of Greece, occupies a strategically important position just west of Athens, forming a crucial part of the Greater Athens Urban Area. Its coordinates (38.0167, 23.6833) place it on a relatively flat plain, a geological feature resulting from alluvial deposits over millennia. The terrain is predominantly low-lying, averaging around 30-50 meters above sea level, which unfortunately limits natural air dispersion. The surrounding landscape is a mix of urban sprawl, transitioning gradually into agricultural land further west, primarily olive groves and vineyards. This urban–rural gradient introduces localized pollution sources, including agricultural emissions and dust from tilling practices, which can impact Peristéri’s air quality, particularly during harvest seasons. The proximity to Athens, a major industrial and transportation hub, is a dominant factor. Heavy traffic flows along major arterial roads connecting Athens to western Greece pass directly through Peristéri, contributing significantly to vehicular emissions. The Saronic Gulf, located approximately 20 kilometers southeast, offers some potential for sea breezes, but their influence is often moderated by the urban heat island effect and the topography of the surrounding hills. The lack of significant elevation changes within Peristéri itself hinders vertical mixing, trapping pollutants closer to ground level and exacerbating air quality challenges. The city’s dense residential and commercial development further compounds these issues, creating a complex interplay of local and regional pollution sources.

Peristéri’s air quality experiences a distinct seasonal cycle heavily influenced by meteorological conditions. Summer (June-August) typically sees the highest temperatures and prolonged periods of calm winds, frequently leading to temperature inversions. These inversions trap pollutants near the ground, resulting in stagnant air and elevated concentrations of particulate matter and ozone. August, in particular, often witnesses a peak in pollution due to a combination of heat, reduced wind speeds, and increased activity related to summer tourism. Spring (March-May) and Autumn (September-November) generally offer improved air quality, with more frequent wind events that help disperse pollutants. However, agricultural burning, a traditional practice in the surrounding areas, can occasionally contribute to localized spikes in particulate matter during these transitional seasons. Winter (December-February) brings cooler temperatures and increased humidity, which can trap moisture and contribute to fog formation. While this can temporarily reduce ozone levels, it can also exacerbate particulate matter pollution, especially when combined with domestic heating and traffic. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during periods of stagnant air, particularly during the summer months. Maintaining awareness of local air quality reports and avoiding peak traffic hours are also advisable throughout the year. The influence of the Aegean Sea breezes is variable, sometimes providing relief but often being disrupted by the urban landscape.