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Moscow, Russia's capital and Europe's most populous city, occupies a strategic position on the Moskva River within the vast East European Plain, approximately 150 meters above sea level. This low-lying urban expanse sits within the Moscow Basin—a broad depression surrounded by gentle hills that significantly influences local meteorology. The city's geography creates a distinct urban–rural gradient, with dense central districts giving way to sprawling suburbs, industrial zones, and eventually the mixed forests and agricultural lands of Moscow Oblast. Moscow's location far from major seas results in a continental climate with limited natural ventilation, while the Moskva River and numerous smaller waterways provide minimal moderating effects on air quality. The surrounding landscape, characterized by flat to rolling terrain, facilitates temperature inversions that trap pollutants close to the ground, particularly during winter months. Industrial emissions from manufacturing facilities in southeastern districts combine with ubiquitous vehicle exhaust from Moscow's notorious traffic congestion, while construction dust from the city's perpetual development projects adds to the particulate burden. The urban heat island effect intensifies pollution concentrations in central areas, creating a stark contrast with cleaner air in peripheral green zones like Losiny Ostrov National Park.

Moscow's air quality follows a pronounced seasonal rhythm dictated by its humid continental climate. Winter months from November through February represent the peak pollution period, when temperature inversions in the Moscow Basin trap vehicle exhaust and residential heating emissions beneath a stagnant atmospheric lid, exacerbated by limited daylight and reduced photochemical activity. Sensitive groups should minimize outdoor exertion during these months, particularly on windless days when PM2.5 concentrations spike. Spring brings gradual improvement as increasing solar radiation breaks up inversions and precipitation washes away accumulated pollutants, though March and April can still experience episodes of road dust resuspension as snow melts. Summer offers the cleanest air overall, with June through August benefiting from stronger ventilation, frequent precipitation, and reduced heating emissions, making this the optimal season for outdoor activities despite occasional ozone formation during heatwaves. Autumn sees a gradual deterioration as temperatures drop, heating systems activate, and atmospheric stability increases, with October serving as a transition month before the winter pollution season fully establishes. Throughout the year, wind direction plays a crucial role—easterly winds can transport industrial emissions from southeastern districts across the city, while westerly flows generally bring cleaner air from less developed regions.