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Anguo, situated in the central plains of Hebei Province, occupies a strategic position within the North China Plain, approximately 200 kilometers southwest of Beijing and 150 kilometers southeast of Shijiazhuang. This city of 363,000 residents lies at an elevation of around 30-40 meters above sea level, characterized by flat alluvial terrain formed by the ancient sedimentation of the Yellow River basin. Anguo's geography places it within the densely populated and heavily industrialized Beijing-Tianjin-Hebei economic corridor, where urban expansion merges with intensive agricultural zones. The city is surrounded by vast farmlands producing wheat, corn, and medicinal herbs—Anguo is famously known as the 'Medicine Capital of China'—creating a distinct urban-rural gradient where pharmaceutical manufacturing coexists with traditional cultivation. No major rivers flow directly through the city, though it lies within the broader Hai River basin, with seasonal watercourses contributing to local hydrology. This location in the heart of northern China's industrial belt means Anguo experiences significant regional air pollution transport, particularly from coal-fired power plants, steel production facilities in nearby cities like Baoding, and vehicular emissions from the extensive highway network connecting major urban centers. The flat topography inhibits natural ventilation, allowing pollutants to accumulate, especially during periods of atmospheric stability. The city's position downwind of Beijing during certain weather patterns further exacerbates air quality challenges, as it receives transported pollution from the capital region while contributing its own emissions from pharmaceutical processing and general urban activities.

Anguo's air quality follows distinct seasonal patterns shaped by northern China's continental monsoon climate. During winter (December-February), pollution peaks dramatically due to coal combustion for heating, combined with frequent temperature inversions that trap pollutants near the surface. Cold, stagnant air masses create persistent haze, with January typically representing the worst conditions—residents, especially those with respiratory conditions, should limit outdoor activities and use air purifiers indoors. Spring (March-May) brings gradual improvement as temperatures rise and winds increase, though March and April can still experience severe dust storms from the Gobi Desert, mixing with local industrial emissions to create hazardous particulate matter. Sensitive groups should monitor forecasts for dust alerts during this transitional period. Summer (June-August) offers the cleanest air, with the East Asian monsoon bringing southeasterly winds that disperse pollutants, though high temperatures can occasionally trigger ozone formation on sunny afternoons. This season provides the best window for outdoor exercise, particularly in July and August when rainfall helps cleanse the atmosphere. Autumn (September-November) sees deteriorating conditions as heating season approaches and atmospheric stability increases; October often marks a sharp decline in air quality as agricultural burning in surrounding regions combines with urban emissions. Throughout the year, sensitive populations including children, elderly residents, and those with asthma or heart conditions should avoid morning outdoor activities when pollution concentrations are highest and consider wearing masks during peak pollution episodes.