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Hong'an, located in Heilongjiang Province in northeastern China, occupies a strategic position within the Songnen Plain, a vast agricultural heartland bordered by the Greater Khingan Mountains to the west and the Lesser Khingan Mountains to the north. At coordinates 47.2100°N, 123.6100°E, this city of approximately 290,000 residents sits at a moderate elevation of around 150-200 meters above sea level, characterized by flat to gently rolling terrain typical of the plain. Its urban character blends administrative functions with agricultural processing, situated within one of China's major grain-producing regions, particularly for corn, soybeans, and wheat. Hong'an lies approximately 200 kilometers northwest of Harbin, the provincial capital, placing it within the broader Northeast China industrial belt, though its immediate surroundings are dominated by rural farmland. The city is not directly adjacent to major water bodies, with the nearest significant river being the Nen River to the east, which influences local humidity. This geographic setting profoundly affects air quality: the flat terrain allows pollutants from urban activities, agricultural burning, and regional industry to disperse widely but also facilitates temperature inversions that trap pollutants near the surface. The urban-rural gradient sees cleaner air in surrounding farmlands, but seasonal agricultural practices and occasional transport of industrial emissions from nearby cities can degrade air quality, particularly during stagnant weather conditions.

Hong'an experiences distinct seasonal air quality patterns driven by its continental monsoon climate with cold, dry winters and warm, humid summers. In winter (December-February), air pollution typically peaks due to coal burning for heating, combined with frequent temperature inversions that trap pollutants near the ground, creating hazy conditions; sensitive groups like children, the elderly, and those with respiratory conditions should limit outdoor exposure during this period. Spring (March-May) brings gradual improvement as temperatures rise and winds increase, dispersing pollutants, though occasional dust storms from the Mongolian Plateau can cause short-term spikes—April and May are generally favourable for outdoor activities. Summer (June-August) sees the cleanest air due to abundant rainfall and strong southerly monsoonal winds that flush out pollutants, with July and August being optimal for outdoor pursuits despite higher humidity. Autumn (September-November) presents a mixed picture: early autumn remains relatively clean, but late autumn often sees increased pollution from agricultural residue burning after harvests and reduced wind speeds, making October a month to monitor for sensitive individuals. Throughout the year, fog can exacerbate pollution visibility issues, particularly in transitional seasons, but severe weather hazards are minimal. Health guidance emphasizes checking local air quality reports seasonally, using air purifiers indoors during peak periods, and planning outdoor activities for midday when mixing heights are highest.