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Zhangmu Touwei, nestled within the sprawling Guangdong province of China, occupies a geographically complex position that significantly influences its air quality. Located at approximately 22.9149° latitude and 114.0833° longitude, the city sits on the periphery of the Pearl River Delta, a region renowned for its rapid urbanization and industrial development. The surrounding landscape is a blend of gently rolling hills and fertile plains, characteristic of the southern Chinese lowlands. While not directly adjacent to a major river, the proximity to the Pearl River system, and its associated network of canals and waterways, contributes to regional humidity and can impact atmospheric stability. The urban–rural gradient transitions relatively quickly, with agricultural zones – primarily rice paddies and fruit orchards – existing within a short distance of the city limits. This agricultural activity, while vital to the regional economy, can contribute to localized pollution through the use of fertilizers and occasional agricultural burning. Further afield, the industrial belts of the Pearl River Delta, particularly those concentrated around Shenzhen and Guangzhou, exert a considerable influence, with pollutants transported by prevailing winds. The terrain, though generally flat, features subtle elevation changes that can create localized areas of poor air circulation, especially during periods of temperature inversion. The city's location, therefore, positions it as both a recipient of regional pollution and a contributor to localized air quality challenges, compounded by its ongoing urban expansion.

Zhangmu Touwei’s air quality experiences a distinct seasonal cycle dictated by the region’s subtropical monsoon climate. The wet season, spanning roughly from April to September, brings frequent rainfall and higher humidity, generally leading to improved air quality as pollutants are washed from the atmosphere. However, periods of persistent fog, common during the late summer months, can trap pollutants near the ground, creating localized episodes of reduced visibility and elevated particulate matter. The dry season, from October to March, presents a more challenging scenario. Cooler temperatures during these months often lead to temperature inversions, where a layer of warm air sits above cooler air near the surface, preventing vertical mixing and trapping pollutants. Agricultural burning, though regulated, can still occur during this period, adding to the particulate load. November and December frequently experience the poorest air quality, coinciding with the peak of the dry season and the lingering effects of regional industrial emissions. Spring (March-April) sees a gradual improvement as temperatures rise and rainfall increases. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of fog or temperature inversions. Outdoor activities are generally more favourable during the wet season, although vigilance regarding fog is still advised. The monsoon winds play a crucial role, periodically dispersing pollutants, but their effectiveness is often limited by the atmospheric stability conditions prevalent during the dry season.