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Tongling, situated in southeastern Anhui Province along the southern bank of the Yangtze River, occupies a strategic position within China's Yangtze River Economic Belt. The city's geography is defined by its riverine location at approximately 30.9456°N, 117.8114°E, where the Yangtze flows through a transitional zone between the Jianghuai Hills to the north and the Huangshan Mountains to the south. This terrain creates a valley-like setting with elevations generally below 50 meters, though surrounding hills rise to 200-300 meters, partially enclosing the urban area. Tongling's urban character is heavily industrial, historically centered on copper mining and smelting—earning it the nickname 'Copper Capital of China'—with significant manufacturing sectors including chemicals, machinery, and electronics concentrated along the riverfront. The city's location directly on the Yangtze facilitates industrial transport but also positions it within an air pollution corridor where emissions from upstream industrial cities like Wuhan and downstream metropolises like Nanjing can converge. Surrounding agricultural zones in the Yangtze floodplain contribute occasional biomass burning emissions, while the urban-rural gradient shows decreasing pollution levels moving southward toward less developed mountainous areas. The Yangtze's presence creates localized humidity that can trap pollutants, particularly during stable atmospheric conditions, exacerbating particulate matter accumulation in this industrial river valley.

Tongling's air quality follows distinct seasonal patterns shaped by the East Asian monsoon and its industrial geography. Spring (March-May) brings variable conditions as winter pollution gradually disperses with increasing winds, though temperature inversions can still trap pollutants during calm mornings, making late spring generally more favorable for outdoor activities. Summer (June-August) experiences the cleanest air due to the southeast monsoon bringing moist oceanic air that disperses industrial emissions, with frequent rainfall further scrubbing pollutants from the atmosphere—this is the optimal season for sensitive groups to engage in outdoor activities. Autumn (September-November) sees deteriorating conditions as monsoon winds weaken and temperature inversions become more frequent, with October and November often experiencing the year's worst pollution episodes as industrial emissions accumulate under stable atmospheric conditions. Winter (December-February) presents persistent challenges with cold air masses from the north creating strong temperature inversions that trap pollutants close to the ground, compounded by increased heating emissions and occasional biomass burning from surrounding agricultural areas. Sensitive groups including children, elderly, and those with respiratory conditions should limit prolonged outdoor exposure during late autumn and winter, particularly on calm, foggy mornings when particulate matter concentrations peak. The city's location in the Yangtze valley means pollution episodes can last several days until frontal systems or stronger winds provide ventilation.