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Marhamat, nestled within the fertile Andijon Province of Uzbekistan, occupies a significant position in the Fergana Valley, a densely populated and agriculturally rich region. Located at coordinates 40.5000, 72.3333, the city sits at an elevation of approximately 500 meters (1640 feet) above sea level, contributing to a continental climate. The surrounding landscape is predominantly flat, characterized by extensive cotton fields and orchards, typical of the valley’s agricultural focus. The city’s air quality is intrinsically linked to this agricultural dominance; pesticide use and seasonal burning of agricultural waste are major contributing factors. Marhamat isn’t directly adjacent to large bodies of water, but benefits from irrigation canals drawing from the numerous rivers originating in the surrounding mountains. The urban-rural gradient is relatively sharp, with the city centre transitioning quickly to agricultural land. While not a major industrial hub itself, Marhamat’s proximity to larger industrial centres within the Fergana Valley, such as Andijon city, means it can experience transboundary pollution. The valley’s topography, enclosed by mountains, often traps pollutants, exacerbating air quality issues, particularly during periods of calm weather. Dust storms originating from the arid regions further south also impact the city’s air.

Marhamat experiences a distinct seasonal air quality pattern dictated by its continental climate. Spring (March-May) sees a rise in particulate matter due to dust storms and the burning of residual agricultural waste after the winter. Temperatures begin to rise, potentially leading to increased ground-level ozone formation. Summer (June-August) is typically the hottest and driest period, with relatively stable air masses that can trap pollutants. While rainfall is minimal, occasional thunderstorms can temporarily improve air quality by washing away dust and particles. Autumn (September-November) is often the most challenging period. The harvest season brings widespread burning of crop residue, significantly increasing PM2.5 and PM10 levels. Temperature inversions become more frequent, trapping pollutants near the ground. Winter (December-February) brings colder temperatures and reduced agricultural activity, leading to a decrease in some pollutants. However, increased reliance on coal and wood for heating contributes to higher levels of soot and carbon monoxide. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during autumn and winter. Avoiding peak burning times in autumn and exercising indoors on cold, still winter days is advisable.