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Fujin is a county-level city in Heilongjiang Province, situated in the northeastern corner of China's Sanjiang Plain where the Songhua, Heilongjiang, and Wusuli rivers converge. This strategic position at approximately 47.25°N latitude and 132.03°E longitude places Fujin within the vast Northeast China Plain, characterized by flat alluvial terrain with an average elevation of just 60-80 meters above sea level. The city lies approximately 400 kilometers northeast of Harbin and 200 kilometers from the Russian border, functioning as an important agricultural and transportation hub in the Sanjiang Economic Zone. Fujin's urban core is surrounded by extensive rice paddies and soybean fields that dominate the landscape, creating a distinct urban-rural gradient where the compact city center transitions abruptly into expansive agricultural lands. The city's proximity to the Songhua River provides some moderating influence on local climate but also contributes to humidity levels that can affect pollution dispersion. Fujin's location in China's 'breadbasket' region means agricultural activities including crop residue burning significantly impact air quality, while its position downwind from industrial centers in southern Heilongjiang and Jilin provinces exposes it to regional pollution transport. The flat terrain offers little natural barrier to pollutant dispersion, allowing both local emissions and transported pollution to accumulate under stagnant atmospheric conditions.

Fujin experiences dramatic seasonal variations in air quality driven by its continental monsoon climate with cold, dry winters and warm, humid summers. During winter (December-February), severe temperature inversions trap pollutants near the surface, while residential heating emissions from coal and biomass burning combine with limited atmospheric mixing to create the year's worst air quality episodes, particularly in January when temperatures plummet below -20°C. Spring (March-May) brings gradual improvement as temperatures rise and winds increase, though March and April see occasional pollution spikes from agricultural field preparation and occasional dust events. Summer (June-August) offers the cleanest air with frequent rainfall scavenging pollutants, strong southerly monsoon winds providing ventilation, and reduced heating emissions, making July and August ideal for outdoor activities. Autumn (September-November) begins with relatively good air quality in September but deteriorates rapidly in October as temperatures drop, heating season commences, and agricultural burning of crop residues peaks, creating hazardous conditions that persist into early winter. Sensitive groups including children, elderly residents, and those with respiratory conditions should limit outdoor exertion during winter pollution episodes and autumn burning periods, while generally enjoying good air quality protection during summer months. The city's location in a river basin can exacerbate fog formation in transitional seasons, occasionally trapping pollutants near the surface.