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Qorashina, nestled within the Qashqadaryo Region of Uzbekistan, occupies a geographically significant position at approximately 38.3394° N, 66.5619° E. The city’s terrain is characterized by gently rolling plains, typical of the Central Asian landscape, situated within the broader Fergana Valley. This valley, a fertile agricultural heartland, directly influences Qorashina’s surroundings, with extensive cotton fields and orchards dominating the rural landscape immediately beyond the urban periphery. The Qashqadaryo River, a vital water source for the region, flows relatively close to the city, though its direct impact on Qorashina’s air quality is more indirect, primarily influencing humidity levels. Elevation sits around 380 meters above sea level, contributing to a relatively stable atmospheric layer, which can, under certain conditions, exacerbate pollution accumulation. Qorashina’s urban character is that of a small, developing town, largely reliant on agriculture and light industry. The urban–rural gradient is sharp; the city transitions quickly into agricultural land, with limited industrial belts immediately adjacent. Further afield, the landscape gradually rises towards the more rugged foothills of the Pamir-Alay mountain range, impacting regional wind patterns. The valley’s topography, combined with the prevalence of agricultural practices (including fertilizer use and seasonal burning of crop residues), and the presence of smaller-scale industrial activities, creates a complex interplay of factors that can influence local air quality, particularly during periods of stagnant weather.

Qorashina’s air quality experiences a distinct seasonal cycle heavily influenced by its climate and surrounding agricultural practices. Spring (March-May) often sees a gradual improvement as temperatures rise and winds increase, dispersing accumulated pollutants. However, this period also coincides with the start of the agricultural season, bringing potential increases in particulate matter from tilling and fertilizer application. Summer (June-August) is typically the most challenging period. High temperatures and prolonged periods of calm weather frequently lead to temperature inversions, trapping pollutants close to the ground. The intense heat also encourages the release of volatile organic compounds (VOCs) from agricultural lands. Autumn (September-November) presents a mixed picture. While winds generally pick up, the harvest season and subsequent burning of crop residues contribute significantly to elevated levels of smoke and particulate matter, particularly in October and November. Winter (December-February) is often characterized by cold, stable air and frequent fog, which further restricts pollutant dispersion and can lead to periods of poor air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during summer and autumn, limiting outdoor activity during peak pollution episodes. The prevalence of wood-burning stoves for heating in some households during winter can also contribute to localized air quality issues. Maintaining indoor air quality through ventilation and air purification can be beneficial during periods of elevated outdoor pollution.