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Shāhīn Dezh, nestled within Āz̄arbāyjān-e Gharbī province in Iran, occupies a geographically significant position in the northwestern part of the country. The city sits at an elevation of approximately 1,430 meters (4,690 feet) amidst the Zagros Mountains, a landscape characterized by rugged terrain and rolling hills. This mountainous setting profoundly influences local air quality. The surrounding region is predominantly agricultural, with wheat and barley cultivation common in the valleys, alongside livestock farming. While not a major industrial hub itself, Shāhīn Dezh is situated within a region experiencing increasing industrial activity in nearby cities, contributing to regional background pollution. The city’s location within a valley can exacerbate pollution episodes, trapping emissions during periods of atmospheric stability. The urban-rural gradient is relatively sharp, transitioning quickly from the built-up areas of Shāhīn Dezh to agricultural lands and then to more remote mountainous regions. The lack of significant bodies of water nearby means limited natural dispersion of pollutants. Topography directs airflow, creating localized wind patterns that can concentrate or dilute pollutants depending on prevailing conditions. Understanding these geographical factors is crucial for assessing and mitigating air quality challenges in Shāhīn Dezh.

Air quality in Shāhīn Dezh experiences distinct seasonal variations. Spring (March-May) often sees a temporary improvement as rainfall washes away accumulated particulate matter, though agricultural burning can introduce localised spikes in pollution. Summers (June-August) are typically drier, with higher temperatures and increased potential for dust storms originating from the surrounding arid and semi-arid regions, impacting visibility and respiratory health. Autumn (September-November) is often the most challenging period. Temperature inversions become more frequent, trapping pollutants near the ground, and increased heating demand contributes to higher emissions from domestic sources. November is particularly prone to stagnant air conditions. Winters (December-February) are cold and snowy, with increased reliance on fossil fuels for heating, leading to elevated levels of particulate matter and sulfur dioxide. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during autumn and winter months. Spring offers the most favourable conditions for outdoor exercise. Wind patterns, generally from the west, can occasionally provide relief by dispersing pollutants, but these events are infrequent. Monitoring meteorological conditions is vital for predicting and managing air quality episodes.