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Haicheng, situated within the dynamic coastal landscape of Guangdong province, occupies a strategic position in the southern reaches of the Pearl River Delta’s influence zone. The terrain is characterized by a low-lying coastal plain, punctuated by undulating hills that rise gently from the sea, creating a complex topography that dictates local air movement. Its proximity to the South China Sea is a defining geographic feature, providing a maritime influence that moderates temperatures but also introduces significant humidity. The city sits at a low elevation, which makes it susceptible to the accumulation of pollutants during periods of atmospheric stability. As an urban node within a heavily industrialized regional belt, Haicheng experiences a distinct urban-rural gradient; the core urban areas are surrounded by a mix of intensive agricultural zones and manufacturing clusters. This intersection of maritime air, industrial emissions from the nearby Pearl River Delta economic engine, and localized agricultural activities creates a unique atmospheric environment. The surrounding landscape, a mosaic of paddy fields, aquaculture ponds, and burgeoning industrial parks, acts as both a buffer and a source of particulate matter. Wind patterns are heavily influenced by the sea breeze-land breeze cycle, which can either disperse pollutants toward the interior or trap them against the coastal hills. Consequently, the city's air quality is a product of its maritime proximity, its role in the regional industrial network, and the specific topographical constraints that govern the dispersion of aerosols and gases within its humid, subtropical boundary layer, defining its unique environmental character through the interaction of land and sea.

Haicheng’s air quality follows a distinct pattern dictated by the subtropical monsoon system. During the wet summer months, the air is typically refreshed by heavy rainfall and strong maritime winds, which effectively wash out particulate matter and prevent the buildup of ground-level pollutants. This period is generally the most favorable for outdoor activities, as the frequent convective activity promotes atmospheric mixing. Conversely, the transition into the drier, cooler autumn and winter months brings a shift in meteorological stability. As the northeast monsoon sets in, cooler, denser air can lead to temperature inversions, particularly in the low-lying coastal plains. These inversions trap pollutants from industrial and vehicular sources near the surface, leading to periodic reductions in visibility and increases in aerosol concentrations. Fog is also a significant factor during the late autumn and winter; the combination of high humidity and cooling temperatures often creates thick maritime fog, which can exacerbate the concentration of fine particulates. To minimize health risks, sensitive groups such as children, the elderly, and those with respiratory conditions should exercise caution during these stagnant winter periods, particularly in the early morning when inversions are most pronounced. Monitoring local meteorological changes is essential, as sudden shifts from maritime to continental air masses can rapidly alter local conditions. While summer offers the cleanest air, the winter months require more vigilant health management and indoor-focused activities during periods of heavy fog or thermal stability. Residents should also stay updated on regional air quality advisories to ensure safety in the changing seasons.