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Panglao Island, situated in the province of Bohol, Philippines (9.5790°N, 123.7450°E), presents a unique geographic context influencing its air quality. The island, home to approximately 39,839 residents, is connected to Bohol by two bridges, creating a semi-urbanized landscape transitioning rapidly from coastal resorts to inland agricultural areas. Panglao’s terrain is predominantly undulating, with a central limestone plateau gradually sloping towards white-sand beaches. This topography, combined with its location in the Philippine Sea, means it’s directly exposed to prevailing winds and seasonal monsoons. The surrounding landscape is characterized by coconut plantations, rice paddies, and increasingly, tourism-related infrastructure. While Panglao lacks heavy industry, the increasing number of vehicles supporting tourism, alongside localized construction and agricultural burning, contribute to particulate matter and gaseous pollutants. The proximity to Bohol Island introduces potential for pollutant transfer, particularly during periods of calm winds. The urban-rural gradient is sharp; air quality generally degrades closer to Alona Beach and Dauis, the main tourist hubs, due to concentrated activity. The island’s relatively small size means pollutants can disperse quickly with favourable winds, but temperature inversions, common in tropical climates, can trap them near ground level.

Panglao’s air quality follows a distinct wet and dry season pattern. The dry season, typically from December to May, sees a peak in pollution. Reduced rainfall means less atmospheric cleansing, and increased tourist activity leads to higher vehicle emissions and construction dust. February and March are often the most affected months, with stable atmospheric conditions and strong sunlight promoting photochemical smog formation. The northeast monsoon, bringing cooler, drier air, can also trap pollutants. Conversely, the wet season (June to November) offers significant relief. Heavy rainfall effectively washes away particulate matter, and increased humidity suppresses dust. However, the southwest monsoon can also transport pollutants from other parts of the Philippines and potentially from neighbouring countries. September and October, during the peak of the monsoon, generally experience the cleanest air. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor exposure during the dry season, particularly during peak tourist months. During the wet season, while air quality improves, increased humidity can exacerbate respiratory issues, requiring continued vigilance. Fog is rare, but can occur briefly during inter-monsoon periods.