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Chust, nestled in the Fergana Valley of Uzbekistan, occupies a unique geographic position that significantly influences its air quality. Located at approximately 40.9978° N, 71.2403° E and an elevation of around 780 meters (2,560 feet) above sea level, the city sits on the southern slopes of the Tian Shan mountain range. This mountainous backdrop creates a natural barrier, often trapping pollutants within the valley, particularly during periods of low wind. The Fergana Valley itself is a fertile agricultural region, and Chust’s proximity to these farmlands means agricultural practices, including fertilizer use and seasonal burning of crop residues, contribute to local air pollution. The urban–rural gradient around Chust is relatively sharp; the city transitions quickly into agricultural land and then into the foothills of the Tian Shan. While the valley floor benefits from irrigation from the Syr Darya River, the river's influence on local air quality is minimal. The city’s urban character is characterized by a mix of traditional residential areas and newer developments, with a growing industrial sector contributing to emissions. The surrounding landscape is dominated by orchards, vineyards, and cotton fields, typical of the Fergana Valley. Topography plays a crucial role; cold air, denser than warmer air, tends to sink into the valley, leading to temperature inversions, especially during the colder months, further exacerbating air quality challenges by preventing vertical mixing of pollutants. The valley's enclosed nature, combined with agricultural activity and industrial presence, creates a complex interplay affecting Chust’s air quality.

Chust’s air quality experiences a distinct seasonal cycle dictated by meteorological patterns and agricultural practices. Spring (March-May) sees a gradual improvement as temperatures rise and winds increase, dispersing accumulated winter pollutants. However, the start of the agricultural season brings increased dust from tilling fields and the potential for localized smoke from early crop burning. Summer (June-August) generally offers the best air quality, with consistent winds and higher temperatures promoting good ventilation. However, intense heat can contribute to ground-level ozone formation, a secondary pollutant. Autumn (September-November) marks a concerning shift. As temperatures cool, the valley experiences more frequent temperature inversions, trapping pollutants near the ground. Agricultural burning intensifies during this period, significantly degrading air quality. Fog, common in autumn and winter, further compounds the problem by reducing visibility and trapping pollutants. Winter (December-February) is typically the most challenging season. Cold, stable air masses settle in the valley, leading to prolonged periods of poor air quality. Temperature inversions are frequent, and wind speeds are often low, preventing pollutant dispersion. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor activity during these periods, particularly on days with visible haze or fog. Maintaining indoor air quality through ventilation and air purification can also be beneficial. The combination of valley geography, agricultural practices, and seasonal weather patterns creates a dynamic air quality profile in Chust.