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Derecik, nestled in the Hakkâri Province of southeastern Turkey, occupies a unique and challenging geographic position. Located at coordinates 37.0830, 44.3110, the city is deeply embedded within the rugged terrain of the Tur Abdin Mountains, a region characterised by steep slopes, narrow valleys, and high elevation – Derecik sits at approximately 1,680 meters above sea level. This mountainous landscape significantly influences local air quality, restricting atmospheric circulation and creating pockets where pollutants can accumulate. The surrounding area is predominantly rural, with limited industrial development, though agricultural practices, particularly livestock farming, are prevalent. Derecik’s proximity to the Iraq and Syria borders adds a layer of geopolitical complexity. The urban-rural gradient is sharp; the city itself is relatively small with a population of 13,220, quickly transitioning to sparsely populated, mountainous countryside. There are no major bodies of water immediately adjacent to Derecik, but the region is a source for numerous small streams and rivers originating from snowmelt and rainfall. The terrain funnels winds, creating localised patterns that affect pollutant dispersion. Dust from unpaved roads and agricultural activities contributes to particulate matter, while heating during cold winters is a key source of smoke and other emissions. The topography exacerbates these issues, limiting natural ventilation.

Derecik experiences a distinct seasonal air quality pattern dictated by its mountainous climate. Winters (November to March) are harsh, with heavy snowfall and frequent temperature inversions. These inversions trap cold air, and consequently pollutants from wood-burning stoves and domestic heating, near the ground, leading to periods of reduced air quality. January and February are typically the most challenging months. Spring (April-May) brings melting snow and increased agricultural activity, potentially raising dust levels, but generally improved ventilation. Summers (June-August) are relatively dry and warm, with prevailing winds offering some dispersion, resulting in the best air quality of the year. However, wildfires in surrounding regions can occasionally impact Derecik. Autumn (September-October) sees a return to cooler temperatures and increased heating demands, alongside agricultural burning, which can contribute to localised smoke. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter inversions and periods of agricultural burning. Monitoring wind direction is crucial; winds from the south or east may carry pollutants from neighbouring regions. Fog, common in the colder months, can exacerbate particulate matter concentrations, reducing visibility and impacting respiratory health.