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Kūysinjaq, nestled within the Arbīl Governorate of Iraqi Kurdistan, occupies a geographically significant position at approximately 36.08° N, 44.62° E. The town’s setting is defined by the foothills of the Zagros Mountains, a dramatic landscape that profoundly influences its microclimate and air quality. Situated at an elevation of roughly 1,350 meters (4,430 feet) above sea level, Kūysinjaq experiences a distinct alpine character, with cooler temperatures compared to lower-lying regions of Iraq. The surrounding terrain is characterized by rugged slopes, terraced agricultural fields, and scattered pockets of woodland, primarily composed of deciduous trees and shrubs. This agricultural activity, while vital to the local economy, can contribute to seasonal particulate matter, particularly during harvest periods. Kūysinjaq’s urban fabric is relatively compact, reflecting its smaller population of around 19,878. The town’s rural-urban gradient is gradual, with agricultural land extending outwards, interspersed with smaller villages. While not directly adjacent to major rivers, the region benefits from seasonal rainfall and groundwater resources. The proximity to Arbīl, a rapidly developing urban center and industrial hub, introduces a potential source of transboundary pollution. Prevailing winds, generally flowing westward from the Zagros Mountains, can carry pollutants from Arbīl and surrounding industrial zones towards Kūysinjaq, impacting local air quality. The mountainous terrain also creates localized valleys and depressions, which can trap pollutants under certain meteorological conditions, exacerbating air quality challenges.

Kūysinjaq’s air quality follows a distinct seasonal pattern dictated by its climate and regional weather systems. The dry season, spanning from late spring through autumn, typically sees the poorest air quality. During these months, temperatures rise, and wind speeds often decrease, leading to stagnant air conditions. Temperature inversions, a common occurrence in mountainous regions, frequently trap pollutants near the ground, intensifying their concentration. Agricultural burning, a traditional practice for land clearing and residue disposal, contributes significantly to particulate matter pollution during this period, particularly in September and October. Dust storms, originating from the deserts further west, can also impact air quality, especially during the late summer and early autumn. The winter months, characterized by cooler temperatures and occasional snowfall, generally offer a respite from the worst pollution. Increased precipitation helps to wash pollutants from the atmosphere. However, periods of cold and calm weather can still lead to localized pollution episodes, especially from residential heating sources. Spring brings a gradual improvement in air quality as temperatures rise and winds increase, dispersing pollutants. The onset of the wet season in late spring and early summer provides further cleansing of the atmosphere. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities on days with visible haze or dust. Maintaining indoor air quality through ventilation and air purification can also be beneficial.