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Agía Paraskeví, nestled within the Attikí (Attica) region of Greece, occupies a unique geographic position significantly influencing its air quality. The city is situated approximately 8km northeast of Athens city centre, on the slopes of Mount Hymettus, an extension of the broader Parnitha mountain range. This terrain creates a complex topography, with varying elevations impacting air circulation and pollutant dispersion. Agía Paraskeví’s elevation ranges from around 200m to 400m above sea level. The surrounding landscape is a mix of urban sprawl, pine forests covering the lower slopes of Hymettus, and agricultural land further east. Proximity to the Aegean Sea, roughly 10km to the south, introduces maritime influences, but these are often moderated by the mountainous barrier. The greater Athens metropolitan area, a major source of pollution, exerts a strong influence on Agía Paraskeví’s air quality. While not directly within major industrial belts, the city experiences pollutant transport from industrial zones concentrated around Elefsina and Aspropyrgos to the west. The urban-rural gradient is steep, transitioning rapidly from dense residential areas to semi-natural environments on the mountain slopes, creating localized microclimates and varying pollution concentrations.

Agía Paraskeví’s air quality follows a distinct seasonal pattern. Summer months (June-August) generally experience better air quality, driven by prevailing meltemi winds from the northeast, which help disperse pollutants over the Aegean Sea. However, high temperatures and intense sunlight promote photochemical smog formation, increasing ozone levels, particularly in July and August. Autumn (September-November) sees a deterioration in air quality as temperatures drop and atmospheric stability increases, trapping pollutants. November is often the worst month, coinciding with the start of heating season and increased vehicle use. Winter (December-February) brings frequent temperature inversions, particularly when high-pressure systems stall over the region, leading to pollutant accumulation in the lower atmosphere. Wood burning for heating exacerbates particulate matter pollution. Spring (March-May) is a transitional period, with fluctuating conditions. March can be dusty due to Saharan dust transport, while April and May see improving conditions as temperatures rise and winds become more frequent. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during November-February and be mindful of ozone levels during peak summer afternoons.