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Marihatag, nestled in the province of Surigao del Sur, Philippines, occupies a geographically complex position. Located at 8.8008°N, 126.2983°E, the municipality is characterized by a terrain that transitions from coastal plains to rolling hills and, further inland, the foothills of the Diwata Mountains. This varied topography significantly influences local air quality. The town’s proximity to the Pacific Ocean introduces consistent sea breezes, which can both disperse and transport pollutants. However, the surrounding landscape is predominantly agricultural, with significant areas dedicated to coconut, banana, and rubber plantations. Agricultural practices, including the use of fertilizers and potential burning of agricultural waste, contribute to particulate matter and ammonia in the air. Marihatag isn’t a heavily industrialized center, but regional mining activities and processing plants further inland can indirectly impact air quality through dust transport. The urban-rural gradient is relatively sharp; the poblacion represents the most concentrated area, while surrounding barangays are largely rural. The elevation, though not extreme, contributes to localized temperature inversions, trapping pollutants during calm weather conditions. The overall geography creates a microclimate susceptible to localized pollution events, particularly during periods of stagnant air.

Marihatag experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, typically from March to May, sees a peak in particulate matter due to increased dust from agricultural activities and drier conditions facilitating the suspension of pollutants. Calm winds during this period exacerbate the issue, leading to localized build-ups. Conversely, the wet season, spanning June to February, generally brings improved air quality. Monsoon rains effectively wash away airborne particles, and increased humidity reduces dust suspension. However, the wet season also brings increased fungal spores and potential for mold growth, impacting respiratory health. November to January, during the peak of the northeast monsoon, can experience periods of persistent cloud cover and reduced sunlight, potentially trapping pollutants near the ground. For those with respiratory sensitivities, avoiding outdoor exertion during the driest months (March-April) is advisable. The transition months (February and June) can be unpredictable, requiring monitoring of local conditions. Health guidance emphasizes staying hydrated, using masks during dusty periods, and ensuring good ventilation indoors, particularly for children and the elderly.