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Ấp Phú Hải, nestled within Bình Thuận province in Vietnam, occupies a coastal position approximately 200 kilometers southeast of Ho Chi Minh City. Its coordinates (11.1667° N, 108.5667° E) place it squarely on the South China Sea, a significant factor shaping its environment and air quality. The surrounding landscape is characterized by a gradual transition from coastal plains to the foothills of the Eastern Highlands, a low-lying mountain range that influences prevailing wind patterns. The terrain is generally flat near the coastline, rising gently inland, with elevations rarely exceeding 100 meters. This low elevation, combined with the proximity to the sea, contributes to a humid, tropical climate. Agriculturally, the region is dominated by aquaculture (shrimp farming is prevalent) and the cultivation of fruits like dragon fruit and mangoes, which can contribute to localized emissions from fertilizers and processing activities. While not directly adjacent to major industrial belts, Phú Hải’s location within Bình Thuận province means it is within reach of industrial zones further inland, potentially experiencing transported pollutants. The urban–rural gradient is relatively smooth; Phú Hải itself is a small village, blending seamlessly into the surrounding agricultural landscape, minimizing the dense urban air pollution often found in larger Vietnamese cities. The coastal breezes, while generally beneficial for dispersion, can also carry marine aerosols and, under certain conditions, pollutants from distant sources. The South China Sea’s influence moderates temperatures but also introduces salt spray, impacting surface deposition and potentially exacerbating respiratory issues.

Phú Hải’s tropical climate dictates a wet and dry season pattern, significantly influencing air quality dynamics. The dry season, typically spanning from December to April, often sees a reduction in rainfall, leading to lower atmospheric moisture. This can exacerbate the effects of temperature inversions, particularly during calmer periods, trapping pollutants closer to the ground. While coastal breezes generally provide ventilation, prolonged periods of light winds during this season can lead to a build-up of localized emissions from agricultural activities and any nearby industrial processes. The wet season, from May to November, brings increased rainfall and higher humidity. Frequent showers effectively ‘wash’ pollutants from the atmosphere, leading to improved air quality. However, heavy rainfall events can also stir up dust and sediment, temporarily degrading air quality. The monsoon season, peaking in September and October, brings strong winds that generally disperse pollutants, but also carries increased levels of marine aerosols. Fog, more common during the cooler months of December and January, can reduce visibility and trap pollutants near the surface. Sensitive groups, such as children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, particularly during periods of stagnant air. Outdoor activities are generally more favorable during the wet season, although vigilance regarding dust during heavy rainfall is advised. Agricultural burning, a common practice in the region, can occasionally contribute to short-term spikes in air pollution, regardless of the season.