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Gaomi is a county-level city in Shandong Province, situated in the heart of the Jiaodong Peninsula in eastern China, approximately 100 kilometers northwest of Qingdao and 200 kilometers east of Jinan. The city lies within the North China Plain, characterized by flat to gently rolling terrain with an average elevation of just 50 meters above sea level, creating conditions conducive to pollutant accumulation. Gaomi's location places it within the densely populated and industrialized Shandong economic corridor, surrounded by agricultural zones that contribute to regional particulate matter through biomass burning and soil dust. The city is positioned between the Bohai Sea to the northwest and the Yellow Sea to the southeast, though its inland placement (about 80 kilometers from the coast) limits the moderating influence of marine breezes. Urban development follows a radial pattern from the historic core, with industrial zones concentrated in peripheral areas, creating distinct pollution gradients. The surrounding landscape features extensive wheat and corn fields interspersed with light manufacturing clusters, contributing to a mix of agricultural and urban emissions. Gaomi's position downwind of major industrial centers like Weifang and Zibo means it frequently receives transported pollutants via prevailing northwesterly winds, while its low-lying topography traps emissions under stable atmospheric conditions, particularly during winter temperature inversions.

Gaomi experiences distinct seasonal air quality patterns shaped by East Asian monsoons and local meteorological conditions. Winter (December-February) brings the poorest air quality due to coal-fired heating, industrial emissions, and frequent temperature inversions that trap pollutants near the surface; cold, stagnant air with light winds from the northwest carries industrial emissions from upstream cities. Sensitive groups should limit outdoor activities during prolonged haze episodes, typically peaking in January. Spring (March-May) sees gradual improvement as temperatures rise and winds strengthen, though March and April can experience dust storms from the Gobi Desert, adding coarse particulate matter to the mix. Summer (June-August) offers the cleanest air with southeasterly monsoon winds from the Yellow Sea dispersing pollutants, though high humidity can occasionally trap ozone precursors, creating afternoon smog on hot days. Autumn (September-November) begins with relatively good conditions in September but deteriorates by late October as heating systems activate and atmospheric stability increases; November often marks the transition to winter pollution patterns. The optimal months for outdoor activities are typically June through September, while January and February require precautions like indoor air purifiers and mask usage during outdoor excursions. Year-round, morning hours often show higher pollution concentrations due to overnight emissions accumulation and lower mixing heights.