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Mambajao, the capital of Camiguin Island in the Philippines, occupies a unique geographic position that significantly influences its air quality. The island itself is a volcanic island, born from multiple volcanic events, resulting in a predominantly mountainous terrain. Mambajao nestles along the northern coast, at a relatively low elevation, though surrounded by the higher peaks of Mount Hibok-Hibok and Mount Vulcan. This coastal location exposes the city to prevailing winds and sea breezes, which can both disperse and concentrate pollutants. The surrounding landscape is a mix of lush rainforest, agricultural lands – primarily dedicated to crops like corn, cassava, and coconut – and volcanic slopes. While Camiguin isn’t heavily industrialized, small-scale agricultural burning is common, particularly during dry periods. The urban-rural gradient is quite sharp; Mambajao is the island’s primary urban center, with surrounding areas remaining largely rural and agricultural. Proximity to the sea introduces salt spray and marine aerosols into the air, while the volcanic soil contributes to particulate matter. The island’s relatively small size means pollutants can accumulate quickly if meteorological conditions aren’t favourable for dispersion. This interplay of volcanic activity, agricultural practices, and coastal influences creates a complex air quality profile for Mambajao.

Mambajao experiences a distinct wet and dry season, rather than traditional four seasons. Air quality generally improves during the wet season (roughly November to May) due to increased rainfall which effectively washes particulate matter from the atmosphere. The prevailing winds during this period also aid in dispersing pollutants. However, increased humidity can contribute to the formation of haze. The dry season (June to October) presents the most challenging air quality conditions. Agricultural burning to prepare fields for planting becomes widespread, releasing significant amounts of smoke and particulate matter. Lower wind speeds during this time allow pollutants to stagnate, and temperature inversions, where a layer of warm air traps cooler air below, can exacerbate the problem. October typically sees the highest concentration of smoke from agricultural activities. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the dry season, particularly in October. Monitoring wind direction is crucial; smoke plumes often drift towards Mambajao from inland agricultural areas. The northeast monsoon, bringing cooler, drier air, can temporarily improve conditions in late December and January, but also increases the risk of dust from exposed soil.