Basilisa Air Quality Index (AQI)

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Basilisa, a municipality nestled within the province of Surigao del Norte in the Philippines, presents a unique geographic context influencing its air quality. Located at 10.0654°N, 125.5968°E, the town is situated on the northeastern coast of Mindanao Island, bordering the Philippine Sea. The terrain is predominantly characterized by rolling hills and coastal plains, with elevation generally low-lying, contributing to limited natural air dispersion. Basilisa’s proximity to the sea introduces a constant influx of sea spray, potentially increasing particulate matter in the air, though this is largely composed of salt and less harmful than industrial pollutants. The surrounding landscape is a mix of coconut plantations, small-scale agriculture, and pockets of mangrove forests along the coastline. While not a major industrial hub, the region supports some mining activities further inland, and transport of minerals through coastal routes could contribute to dust and emissions. The urban-rural gradient is quite sharp; Basilisa itself is relatively small, with a population of 36,911, and quickly transitions to rural agricultural land. This limited urban sprawl means localized sources of pollution, like vehicle emissions and small-scale burning, have a more concentrated impact. The prevailing winds, influenced by the Philippine Sea, play a crucial role in pollutant dispersal, but can also trap pollutants during periods of calm.

Basilisa 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 unpaved roads and agricultural activities like land preparation for planting. Lower humidity during these months also means pollutants are less likely to be washed out by rain. This is a period when residents with respiratory conditions should exercise caution. The onset of the wet season, around June, brings a significant improvement in air quality as rainfall effectively scrubs the atmosphere. However, increased humidity can also foster mold growth, potentially exacerbating allergies. The peak of the rainy season, July to September, often coincides with typhoons impacting the region. While these storms temporarily cleanse the air, the aftermath can see increased debris and potential flooding, leading to localized pollution. October to November represents a transitional period with generally moderate air quality. December to February sees calmer winds and a return to drier conditions, though less pronounced than the peak dry season. Sensitive groups – children, the elderly, and those with pre-existing respiratory illnesses – should limit strenuous outdoor activity during the drier months and monitor their health closely.