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Omsk, situated in southwestern Siberia within Russia's Omskaya Oblast', occupies a strategic position at the confluence of the Irtysh and Om Rivers, approximately 2,700 kilometers east of Moscow. This major industrial and transportation hub lies on the West Siberian Plain, characterized by flat terrain with an average elevation of just 90 meters above sea level, which significantly influences its air quality dynamics. The city's location within the vast Siberian expanse places it far from coastal influences, creating a continental climate with extreme temperature variations that trap pollutants. Omsk is surrounded by extensive agricultural zones to the south and west, where seasonal burning and dust contribute to particulate matter, while to the north and east, the landscape transitions to taiga forests that offer limited pollution dispersion. The urban core, home to over 1.1 million residents, features dense industrial districts along the Irtysh River, including oil refining, chemical production, and machinery manufacturing, which emit substantial pollutants. The city's linear development along riverbanks creates distinct urban–rural gradients, with industrial emissions concentrating in valley areas where temperature inversions are common. Proximity to the Irtysh River provides some atmospheric moisture but insufficient to regularly cleanse the air, while the flat terrain inhibits wind-driven dispersion, allowing pollutants to accumulate over the city, particularly during stable atmospheric conditions.

In Omsk, air quality follows a pronounced seasonal pattern driven by Siberia's harsh continental climate. Winter, from December through February, brings the worst pollution episodes as extreme cold temperatures, often dropping below -20°C, create persistent temperature inversions that trap emissions from heating systems, industry, and vehicles near the ground. These stagnant conditions, combined with low wind speeds and frequent fog, lead to hazardous smog buildup, making this period particularly risky for outdoor activities, especially for children, the elderly, and those with respiratory conditions. Spring, from March to May, sees gradual improvement as rising temperatures break inversions and increased wind disperses pollutants, though melting snow can expose accumulated winter grime and agricultural preparations may add dust. Summer, from June to August, offers the cleanest air with warmer temperatures, higher atmospheric mixing, and occasional rainfall that washes away particulates, making it the optimal season for outdoor exercise and recreation. Autumn, from September to November, brings declining air quality as temperatures drop, inversions return, and reduced precipitation allows pollutants to accumulate, with October often marking a transition to winter smog. Sensitive groups should monitor local air quality reports year-round, limit strenuous outdoor activities during winter inversions, and consider indoor air filtration during peak pollution months.