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Ptolemaḯda, nestled in the fertile plain of Western Macedonia, Greece, occupies a strategic position at the foothills of the Pindus Mountains, approximately 15 kilometers from the North Aegean Sea. Its coordinates (40.5167, 21.6833) place it within a region historically significant for agriculture and, more recently, for industrial activity. The city’s terrain is predominantly flat, characteristic of the alluvial plain, facilitating urban sprawl but also contributing to potential air quality challenges. Ptolemaḯda sits at an elevation of roughly 60 meters, minimizing the natural dispersion of pollutants, particularly during periods of atmospheric stability. The surrounding landscape is a mix of agricultural fields – primarily maize, wheat, and tobacco – and scattered woodlands, with the Pindus range providing a backdrop and influencing local wind patterns. Historically, the region’s proximity to coal mines and the development of a lignite-fired power plant (Megas Alexandros) have significantly shaped the local economy and, consequently, the urban environment. The urban–rural gradient is relatively sharp, with agricultural land quickly transitioning to residential and industrial zones. The city’s location, while benefiting from access to transportation routes and fertile land, presents a unique challenge regarding air quality due to the combination of industrial emissions, agricultural practices (including burning of crop residues), and the potential for stagnant air masses, especially during certain times of the year. The relatively close proximity to the sea also introduces the possibility of marine-borne pollutants impacting local air quality.

Ptolemaḯda’s air quality experiences a distinct seasonal cycle heavily influenced by meteorological conditions. Winters, spanning roughly November to March, are often characterized by temperature inversions, where a layer of warm air traps cooler air near the ground, hindering vertical mixing and leading to pollutant accumulation. This is exacerbated by reduced sunlight hours and calmer wind conditions, typical of the season. Agricultural burning, a traditional practice for land clearing and residue disposal, also contributes significantly to particulate matter during this period. Spring (April-May) brings a gradual improvement as temperatures rise, and wind speeds increase, aiding in pollutant dispersal. However, dust storms originating from North Africa can occasionally impact air quality. Summers (June-August) generally see the best air quality due to strong, consistent winds and high temperatures promoting atmospheric mixing. However, heatwaves can lead to ozone formation, a secondary pollutant. Autumn (September-October) presents a transitional period, with decreasing temperatures and increasing humidity, potentially leading to stagnant air conditions and a resurgence of particulate matter, particularly as agricultural burning resumes. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months and be mindful of potential dust events in spring. Outdoor activities are generally more favorable during summer, but vigilance regarding ozone levels is advised. The city’s location within a basin further compounds these seasonal effects, trapping pollutants and prolonging periods of poor air quality.