Aroroy Air Quality Index (AQI)

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Aroroy, nestled on the southeastern coast of Masbate Island in the Philippines, presents a unique geographic context influencing its air quality. The city’s coordinates (12.5125, 123.3989) place it directly on the Pacific coastline, exposed to prevailing winds and seasonal monsoon patterns. The terrain is characterized by a mix of rolling hills and coastal plains, with elevation generally increasing inland. This topography can contribute to localized air stagnation, particularly in valleys and lower-lying areas. Aroroy’s urban character is that of a developing coastal city, with a population of 88,351, heavily reliant on fishing and increasingly, mining activities. Surrounding Aroroy are extensive agricultural lands, primarily coconut and rice paddies, and significant areas dedicated to chromite mining – a key industry for Masbate province. The proximity to the ocean provides some natural ventilation, but also introduces sea salt aerosols into the atmosphere. The urban-rural gradient is relatively sharp, transitioning quickly from the city center to rural agricultural and mining landscapes. Dust from mining operations and agricultural burning are significant local emission sources, impacting air quality, especially during the dry season. The island’s isolation also limits the dispersal of pollutants.

Aroroy 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 pollution. Reduced rainfall suppresses dust, particularly from the extensive chromite mining operations surrounding the city, and agricultural practices like land preparation often involve burning. Stable atmospheric conditions and weaker winds during this period exacerbate the problem, leading to localized air stagnation. Conversely, the wet season, from June to February, brings relief. Monsoon rains effectively wash away pollutants, improving air quality significantly. However, increased humidity can also promote the formation of mold and mildew, impacting respiratory health. November to January, during the peak of the northeast monsoon (Amihan), often experiences strong winds that further disperse pollutants, making it a generally favourable period for outdoor activity. Temperature inversions, though less frequent than in larger metropolitan areas, can occur during calmer periods, trapping pollutants near the ground. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should exercise caution during the dry season and monitor their health closely.