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Kastoriá, nestled in the northwestern region of Greece within Dytikí Makedonía, presents a unique geographic setting profoundly influencing its air quality. The city dramatically occupies a peninsula jutting into Lake Orestiada, a large, shallow lake, and is encircled by a basin formed by the surrounding mountains of the Grammos and Vourinos ranges. This basin topography, while visually stunning, creates a natural trap for air pollutants, limiting dispersion. The terrain is characterised by a mix of lakeside plains and steep, forested slopes. Kastoriá’s elevation, around 620 meters (2,034 feet), contributes to cooler temperatures and potential for temperature inversions, exacerbating pollution events. Historically, the region’s economy revolved around fur production, with numerous workshops concentrated within and around the city. While this industry has evolved, legacy emissions and associated heating demands remain a factor. Surrounding the urban core are agricultural lands, primarily dedicated to livestock farming and some crop cultivation, contributing to ammonia emissions. The urban-rural gradient is relatively sharp, transitioning quickly from the densely built-up peninsula to the more sparsely populated mountainous areas. This geographic configuration dictates that air quality challenges are often localised and influenced by both regional and microclimatic conditions.

Kastoriá’s air quality follows a distinct seasonal pattern. Winter, from December to February, typically sees the poorest air quality. Low temperatures increase reliance on wood and fossil fuel burning for heating, coupled with frequent temperature inversions trapped by the surrounding mountains, leading to pollutant build-up. Fog, common during these months, further reduces visibility and exacerbates particulate matter concentrations. Spring (March-May) brings gradual improvement as temperatures rise and heating needs decrease, though agricultural activities can contribute to ammonia levels. Summer (June-August) generally offers the cleanest air, aided by prevailing winds that promote dispersion and reduced heating demands. However, periods of stagnation can still occur. Autumn (September-November) sees a transition, with increasing heating needs and potential for early-season inversions. Sensitive individuals – children, the elderly, and those with respiratory conditions – should be particularly cautious during winter months, limiting strenuous outdoor activity on cold, still days. Monitoring local conditions and avoiding peak pollution times is advisable. The lake breeze can offer some relief during warmer months, but its effect is localised. Overall, spring and summer are the most favourable seasons for outdoor activities.