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MacArthur, a municipality in Leyte province, Philippines, occupies a strategic coastal position on the western side of the island. Situated at 10.8356°N, 124.9964°E, the terrain is characterized by a relatively flat coastal plain transitioning into rolling hills inland. This low elevation, combined with its location along the Camotes Sea, makes MacArthur particularly vulnerable to marine influences and the transport of pollutants. The surrounding landscape is a mix of agricultural land – primarily rice paddies and coconut plantations – and pockets of secondary forest. While not a major industrial hub itself, MacArthur is within reach of industrial activity in nearby Ormoc City and Cebu, potentially contributing to regional air pollution transport. The urban-rural gradient is fairly sharp; the *poblacion* areas are densely populated, while the periphery quickly gives way to agricultural fields. This proximity to both agricultural practices (burning of crop residue) and the sea (salt spray, potential for aerosol formation) significantly shapes the local air quality profile. The prevailing winds, influenced by the Southeast Asian monsoon, play a crucial role in dispersing or concentrating pollutants, particularly during specific seasons. The coastal location also means increased humidity, which can affect the chemical reactions of pollutants in the atmosphere.

MacArthur experiences a distinct wet and dry season, heavily influenced by the Philippine monsoon system. Air quality generally improves during the wet season (roughly November to May) due to rainfall effectively scavenging particulate matter and suppressing dust. However, increased humidity can also promote the formation of secondary pollutants. The northeast monsoon brings cooler temperatures and increased rainfall, leading to cleaner air, with February and March typically being the most favourable months for outdoor activities. Conversely, the dry season (June to October) sees a rise in air pollution. Agricultural burning, common during land preparation for the next planting season, contributes significantly to particulate matter levels. The southwest monsoon, while bringing some relief, can also trap pollutants due to stable atmospheric conditions. September and October are often the months with the poorest air quality. Temperature inversions, where a layer of warm air traps cooler air near the surface, can exacerbate pollution during calm periods. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the dry season and be mindful of potential smoke from agricultural fires. Monitoring wind direction is crucial, as pollutants can be transported from surrounding areas.