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Karapürçek, nestled within the Sakarya Province of Turkey, occupies a geographically significant position in the northwest of the country. Located at coordinates 40.6425° N, 30.5386° E, the town is situated on gently undulating terrain, part of the broader Marmara Region. The landscape is predominantly agricultural, characterized by fertile plains used for crop cultivation, interspersed with patches of deciduous forest typical of the Black Sea coastal zone. Karapürçek’s elevation is relatively low, contributing to potential temperature inversions that can trap pollutants. The proximity to the Black Sea, approximately 40km north, introduces maritime influences on local weather patterns, but also means limited dispersion of pollutants during calm conditions. Sakarya River flows nearby, providing irrigation but also potentially acting as a conduit for agricultural runoff containing pollutants. The urban-rural gradient is quite sharp; Karapürçek itself is a relatively small town, surrounded by a predominantly rural agricultural hinterland. Industrial activity is concentrated in larger settlements within Sakarya Province, but transport corridors linking these areas pass through or near Karapürçek, contributing to localised emissions. This combination of agricultural practices, transport links, and topographical features creates a unique set of conditions influencing air quality in Karapürçek.

Air quality in Karapürçek experiences a distinct seasonal rhythm. Spring (March-May) sees a gradual improvement after the winter months, though agricultural burning for land preparation can cause temporary spikes in particulate matter. Summer (June-August) generally offers the cleanest air, benefiting from prevailing winds and higher temperatures promoting dispersion, but ozone formation can be a concern on hot, sunny days. Autumn (September-November) marks a transition, with increased heating demand leading to higher emissions from residential sources, particularly wood and coal burning. This period also coincides with harvest activities, potentially increasing dust and agricultural pollutants. Winter (December-February) is typically the worst period for air quality. Temperature inversions are frequent, trapping pollutants near the ground. Reduced sunlight hinders pollutant dispersion, and increased reliance on solid fuel heating significantly elevates particulate matter and sulfur dioxide levels. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit outdoor exertion during cold, still winter days. Fog, common in the Sakarya region during winter, exacerbates pollution by reducing visibility and trapping pollutants. October and November are often the most challenging months, while July and August generally offer the best conditions for outdoor activities.