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Irkutsk, situated in southeastern Siberia within Russia's Irkutskaya Oblast', occupies a strategic position at the confluence of the Angara and Irkut rivers, approximately 70 kilometers northwest of Lake Baikal—the world's deepest and oldest freshwater lake. This urban center, with a population exceeding 600,000, lies in the Irkutsk-Cheremkhovo Plain, flanked by the Eastern Sayan Mountains to the southwest and the Primorsky Range to the northeast, creating a basin-like topography that profoundly influences local air quality. The city's elevation of approximately 440 meters above sea level, combined with its location in a river valley, fosters frequent temperature inversions, particularly during winter, trapping pollutants near ground level. Irkutsk serves as the administrative, cultural, and economic hub of Eastern Siberia, with urban development concentrated along the Angara River, transitioning to forested taiga and agricultural zones in the periphery. Industrial activities, including energy production, machinery manufacturing, and timber processing, are clustered in the city and nearby areas like Shelekhov, contributing to 'general urban' pollution sources. Proximity to Lake Baikal moderates some climatic extremes but does little to disperse airborne contaminants due to the region's typically low wind speeds. The urban–rural gradient sees denser settlement and industrial zones in the city core, giving way to less polluted suburban and rural districts, though the basin effect means pollution can accumulate across the wider area, affecting air quality throughout the Irkutsk region.

In Irkutsk, air quality follows a distinct seasonal pattern shaped by Siberia's harsh continental climate and local meteorological conditions. Winter, from December to February, brings the worst pollution due to intense cold, with temperatures often plummeting below -20°C, leading to persistent temperature inversions that trap pollutants from heating systems, vehicle emissions, and industrial activities near the ground. This period sees frequent calm winds and dense fog, exacerbating particulate matter accumulation, making it the least favorable time for outdoor activities, especially for sensitive groups like children, the elderly, and those with respiratory conditions. Spring, from March to May, offers gradual improvement as temperatures rise, inversions weaken, and increased wind helps disperse pollutants, though melting snow can stir up dust and lingering industrial emissions may persist. Summer, from June to August, provides the best air quality, with warmer temperatures, more active atmospheric mixing, and occasional rainfall cleansing the air, ideal for outdoor pursuits; however, wildfire smoke from surrounding taiga forests can occasionally drift in, causing short-term spikes. Autumn, from September to November, sees a return to deteriorating conditions as temperatures drop, inversions re-establish, and reduced precipitation allows pollutants to build up again. Sensitive individuals should monitor local air quality reports year-round, limit exertion during high-pollution episodes, and consider indoor air purifiers during peak winter months.