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Yuanshan, nestled within Guangdong province, China, occupies a geographically strategic yet potentially vulnerable position. Located at 24.3733°N, 114.4856°E, the city’s terrain is characterized by a gently undulating landscape transitioning from the Pearl River Delta’s alluvial plains towards the more rugged foothills of the surrounding mountains. This proximity to both flatlands and higher elevations influences local wind patterns and pollutant dispersion. Yuanshan’s relatively low elevation, averaging around 30 meters above sea level, contributes to potential temperature inversions, trapping pollutants near the ground. The city benefits from its location near the Xijiang River, a major tributary of the Pearl River, but this also means increased humidity and potential for fog formation, which can exacerbate air pollution. Surrounding Yuanshan are significant agricultural zones, primarily rice paddies and fruit orchards, alongside emerging industrial areas focused on manufacturing and processing. The urban-rural gradient is relatively sharp, with rapid development occurring around the city center and more traditional agricultural practices persisting in the periphery. This juxtaposition creates complex air quality dynamics, as emissions from industry and transport interact with agricultural practices like biomass burning and fertilizer use, impacting the air shed.

Yuanshan experiences a humid subtropical climate, leading to distinct wet and dry seasons that heavily influence air quality. The spring (March-May) often sees increased particulate matter from agricultural burning as farmers prepare fields for planting, coupled with fluctuating humidity levels. Summer (June-August) brings the monsoon season, offering periods of cleaner air due to rainfall washing away pollutants and stronger winds dispersing emissions. However, high humidity can also trap pollutants, and increased energy demand for cooling contributes to power plant emissions. Autumn (September-November) is generally considered the most pleasant time for air quality, with cooler, drier conditions and reduced agricultural activity. However, this period can also experience temperature inversions, trapping pollutants in the lower atmosphere. Winter (December-February) presents the most challenging air quality conditions. Reduced rainfall, weaker winds, and increased coal consumption for heating contribute to higher concentrations of pollutants. Fog is also common, further reducing visibility and trapping pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during winter months and periods of high humidity. Monitoring local conditions and utilizing air purification systems indoors are recommended.