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Heze is a prefecture-level city in southwestern Shandong Province, China, situated in the heart of the North China Plain. Its coordinates at 35.2343°N, 115.4796°E place it approximately 200 kilometers inland from the Yellow Sea, with an average elevation of just 50 meters above sea level, creating a flat, low-lying terrain that exacerbates air stagnation. The city lies within the Huang-Huai-Hai Plain, one of China's most intensive agricultural regions, surrounded by vast wheat and corn fields that contribute to seasonal biomass burning and dust. Heze's urban character blends traditional rural elements with rapid industrialization, positioned along the economic corridor connecting Shandong's coastal cities to inland provinces like Henan. This location subjects it to regional pollution transport from both the heavily industrialized Bohai Rim to the northeast and agricultural areas to the west. The city lacks significant natural barriers like mountains or large water bodies to disperse pollutants, with only the Yellow River flowing about 50 kilometers to the north, providing minimal moderating influence. The urban-rural gradient is pronounced, with dense central urban areas transitioning abruptly to farmland, creating a mosaic of pollution sources including vehicle emissions, residential heating, and occasional industrial activities from nearby chemical and textile plants. This geographic setting, combined with its position in one of China's most polluted regions, makes Heze particularly vulnerable to poor air quality, especially during periods of atmospheric stability.

Heze experiences distinct seasonal air quality patterns driven by its temperate monsoon climate. In winter (December-February), pollution peaks due to coal-fired heating, temperature inversions that trap pollutants near the ground, and low wind speeds, making these months the worst for outdoor activity, especially for sensitive groups like children and the elderly who should limit exposure. Spring (March-May) sees moderate improvement as temperatures rise and winds increase, though dust storms from the Loess Plateau and agricultural burning in April can cause sporadic spikes, requiring caution for those with respiratory conditions. Summer (June-August) offers the cleanest air, with the East Asian monsoon bringing southeasterly winds that disperse pollutants, higher temperatures reducing heating emissions, and rainfall washing particulate matter from the atmosphere—this is the optimal season for outdoor pursuits. Autumn (September-November) begins with relatively good conditions but deteriorates by late October as heating resumes, fog becomes more frequent, and wind patterns shift, leading to gradual accumulation of pollutants. Throughout the year, sensitive individuals should monitor daily forecasts, use air purifiers indoors during peak periods, and schedule outdoor activities for midday in summer or after rainfall when pollution levels are lowest. Avoiding strenuous exercise during morning and evening rush hours in colder months is also advisable.