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Oqqo‘rg‘on, a small city nestled within Toshkent Province, Uzbekistan, occupies a unique geographic position in the Fergana Valley. Situated at coordinates 40.8764° N, 69.0453° E, the city lies approximately 750 meters above sea level, benefiting from a temperate continental climate. The surrounding landscape is predominantly flat, characteristic of the valley floor, transitioning to the foothills of the Tian Shan mountains to the south and east. This proximity to mountains influences local wind patterns and can contribute to temperature inversions, trapping pollutants. The city’s air quality is significantly impacted by its agricultural surroundings; the Fergana Valley is a major cotton-growing region, and agricultural practices, including pesticide use and burning of crop residue, contribute to particulate matter and other pollutants. Furthermore, Oqqo‘rg‘on’s position along transport routes connecting Toshkent with other regional centres means it experiences emissions from vehicular traffic. The urban-rural gradient is relatively sharp, with agricultural land immediately bordering the city limits. The Chirchiq River flows nearby, but its capacity to naturally cleanse the air is limited given the overall pollution load. Industrial activity, though not concentrated *within* Oqqo‘rg‘on, exists in surrounding districts, adding to the regional pollution burden.

Oqqo‘rg‘on experiences a distinct seasonal air quality pattern. Spring (March-May) often sees a deterioration in air quality due to dust storms originating from the arid regions to the west and the burning of agricultural waste after the winter season. Winds pick up, carrying particulate matter into the city. Summer (June-August) brings relatively cleaner air, as rainfall increases and temperatures are high enough to disperse some pollutants, though ozone formation can be a concern during prolonged sunny periods. However, irrigation practices can contribute to localised humidity and potential mould spore concentrations. Autumn (September-November) is arguably the worst period, coinciding with the cotton harvest and widespread burning of stalks, leading to significant spikes in particulate matter. Temperature inversions become more frequent, trapping pollutants near the ground. Winter (December-February) sees calmer conditions and increased reliance on coal and gas for heating, resulting in elevated levels of sulfur dioxide and particulate matter. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during autumn and winter. Spring dust storms also necessitate caution. Months of June and July generally offer the most favourable conditions for outdoor activity.