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Polýkastro, nestled in the heart of Kentrikí Makedonía, Greece, occupies a strategically important position within the broader Balkan landscape. Situated at coordinates 41.0000, 22.5667, the town lies within a relatively flat agricultural plain, part of the wider Macedonian plain, though gently undulating hills rise to the west and east. The Axios (Vardar) river flows nearby, influencing local microclimates and potentially contributing to humidity levels. Polýkastro’s elevation is modest, around 60-80 meters above sea level, minimizing the effects of strong vertical mixing but not eliminating temperature inversions. The surrounding landscape is dominated by intensive agriculture – primarily cereal crops and fruit orchards – with some livestock farming. This agricultural activity, while economically vital, introduces potential sources of particulate matter from field work and ammonia emissions. The town functions as a transport hub, benefitting from proximity to the Egnatia Odos motorway (A2) and rail lines, which inevitably contribute to localised traffic-related pollution. The urban-rural gradient is relatively sharp; Polýkastro is a defined settlement surrounded by open farmland, meaning pollutant dispersion is less hindered by extensive built-up areas than in larger metropolitan centres. This combination of factors – agriculture, transport, and plain topography – shapes Polýkastro’s unique air quality profile.

Polýkastro’s air quality experiences a distinct seasonal rhythm. Winter, from December to February, often sees the poorest conditions. Low temperatures and frequent temperature inversions trap pollutants near the ground, exacerbated by increased wood burning for heating. Calm, stable atmospheric conditions limit dispersion. Spring (March-May) brings improvement as temperatures rise and winds become more frequent, diluting concentrations. However, agricultural activities intensify, introducing dust and ammonia. Summer (June-August) generally offers the cleanest air, with strong southerly winds effectively flushing out pollutants. High temperatures promote photochemical reactions, potentially forming ozone, but the overall effect is usually positive. Autumn (September-November) is a transitional period. Harvest activities contribute to particulate matter, and the return of stable, cooler weather can lead to localised pollution episodes. Sensitive individuals – children, the elderly, and those with respiratory conditions – should be particularly cautious during winter and autumn. Avoiding strenuous outdoor activity on still, cold days is advisable. Monitoring wind direction and staying informed about local conditions is crucial. Fog, common in the cooler months, can also trap pollutants, reducing visibility and worsening air quality.