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İskilip, nestled in the northern part of Çorum Province, Turkey, occupies a geographically significant position within the Kızılırmak River Valley. The city’s coordinates (40.7361, 34.4739) place it amidst a landscape of rolling hills and fertile plains, at an elevation of approximately 850 meters. This elevation, combined with its inland location, contributes to a continental climate characterized by cold, snowy winters and warm, dry summers. The surrounding terrain is predominantly agricultural, with extensive wheat fields and orchards dominating the landscape. The Kızılırmak River, Turkey’s longest river, flows nearby, influencing local microclimates and providing irrigation for agriculture. While İskilip isn’t a major industrial hub, the presence of smaller-scale agricultural processing and local manufacturing contributes to localized emissions. The urban-rural gradient is quite pronounced; the city centre is relatively compact, quickly transitioning to rural farmland. This proximity to agricultural activities introduces potential sources of particulate matter from dust and seasonal burning of agricultural residue. The valley’s topography can also trap pollutants during periods of calm weather, exacerbating air quality concerns. The prevailing winds generally flow from the northwest, potentially carrying pollutants from more industrialized regions further west.

İskilip’s air quality follows a distinct seasonal pattern. Winter, from December to February, typically sees the poorest air quality. Cold temperatures lead to increased use of coal and wood for heating, releasing significant amounts of particulate matter (PM2.5 and PM10) and sulfur dioxide. Temperature inversions, common in the valley during these months, trap pollutants near the ground, worsening conditions. Spring (March-May) brings some improvement as heating demand decreases, but agricultural burning of stubble after the winter harvest can temporarily elevate particulate matter levels. Summer (June-August) generally offers the cleanest air, with warm temperatures, prevailing winds dispersing pollutants, and minimal heating needs. However, prolonged dry spells can lead to dust storms, increasing PM10 concentrations. Autumn (September-November) sees a gradual decline in air quality as heating begins again. October and November are often characterized by stagnant air masses and increased wood burning. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter months and periods of agricultural burning. Monitoring local conditions and avoiding peak pollution times is crucial for maintaining respiratory health.