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Urmia, the capital of West Azerbaijan Province in northwestern Iran, occupies a strategic position in the fertile Urmia Plain at an elevation of approximately 1,330 meters above sea level. The city lies on the western shore of Lake Urmia, one of the largest salt lakes in the Middle East, which profoundly shapes its environmental dynamics. Surrounded by mountain ranges including the Zagros to the south and west, Urmia's topography creates a basin-like setting that traps pollutants, exacerbating air quality issues. The urban area blends historic Persian architecture with modern expansion, serving as a regional hub for commerce, education, and agriculture. Proximity to Lake Urmia introduces unique pollution sources: as the lake has shrunk due to drought and water diversion, exposed salt flats generate severe dust storms that carry particulate matter and salt crystals into the city. The region is part of Iran's agricultural heartland, with extensive farming zones producing grains, fruits, and nuts, leading to seasonal agricultural burning. Industrial emissions stem from local manufacturing and processing plants, while vehicle exhaust and road dust are amplified by urban traffic. The urban-rural gradient sees pollution concentrated in the city center, with some dispersion into surrounding villages, though topography limits natural ventilation, making geographic context a critical factor in Urmia's persistent air quality challenges.

Urmia's air quality follows a distinct seasonal pattern driven by its cold semi-arid climate and local pollution sources. In winter, from November through February, pollution peaks due to temperature inversions that trap pollutants near the ground, compounded by residential heating using fossil fuels and increased vehicle emissions in cold weather. Sensitive groups, such as those with respiratory conditions, should limit outdoor activities during these months, especially on calm, foggy days when particulate matter accumulates. Spring brings some relief with occasional rainfall and stronger winds that disperse pollutants, though dust storms from Lake Urmia's dry bed can spike particulate levels unpredictably, making March and April variable for outdoor pursuits. Summer sees extreme heat and drought, which intensify dust storms and ozone formation from industrial and vehicle emissions, but higher temperatures and windier conditions often improve overall air quality compared to winter; however, heatwaves can exacerbate health risks for vulnerable populations. Autumn transitions back to worsening conditions as temperatures drop and inversions return, with agricultural burning after harvests in October adding to pollution. Throughout the year, monitoring weather forecasts for dust storms and avoiding outdoor exertion on high-pollution days is advised, with indoor air purifiers recommended for sensitive individuals during peak seasons.