Anilao Air Quality Index (AQI)

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Anilao, Iloilo, Philippines, occupies a coastal position on the southern coast of Panay Island, approximately 18 kilometers southeast of Iloilo City. Its coordinates, 10.9785° N, 122.7531° E, place it within a predominantly low-lying terrain, gently sloping towards the Guimaras Strait. The surrounding landscape is a blend of agricultural land, primarily rice paddies and coconut plantations, interspersed with small-scale fishing villages. This urban–rural gradient is relatively sharp, with Anilao transitioning quickly from residential areas to agricultural fields. The proximity to the strait significantly influences local weather patterns and, consequently, air quality. The elevation is minimal, rarely exceeding 20 meters above sea level, which limits vertical mixing of pollutants and can exacerbate ground-level concentrations. While Anilao itself lacks major industrial zones, its location within the broader Iloilo province means it is indirectly affected by industrial activity in Iloilo City and nearby municipalities. Agricultural practices, including the burning of crop residue after harvest, contribute to localized particulate matter pollution. The prevailing winds from the southwest monsoon generally blow along the coast, potentially carrying pollutants from upwind sources. The coastal environment also means that sea breezes play a crucial role in dispersing pollutants, though this effect can be diminished during periods of calm weather. The town's geography, therefore, presents a complex interplay of natural factors and human activities impacting air quality.

Anilao’s tropical climate dictates a wet and dry season, rather than the four traditional seasons. The dry season, typically from November to May, often sees a slight increase in particulate matter pollution. While rainfall naturally cleanses the air, the reduced precipitation during this period allows for the accumulation of dust and emissions from agricultural burning, a common practice after the harvest of rice and coconut crops. Temperature inversions, though not as frequent as in colder climates, can occasionally occur during the cooler months (December-February), trapping pollutants near the ground, particularly in the mornings. The wet season, from June to October, brought by the southwest monsoon, generally improves air quality due to frequent rainfall and increased wind speeds that disperse pollutants. However, heavy rainfall can also lead to increased humidity, which can exacerbate respiratory issues for sensitive individuals. Fog, though rare, can form during the cooler, drier months, further reducing air quality by trapping pollutants. During the transition months (May and November), air quality can be variable, influenced by shifting wind patterns and unpredictable rainfall. Sensitive groups, such as children, the elderly, and individuals with pre-existing respiratory conditions, should be particularly cautious during the dry season, limiting outdoor activities during peak agricultural burning periods and mornings when inversions are possible. Maintaining indoor air quality through proper ventilation and air filtration is also advisable during these times. The monsoon season offers a respite, but awareness of potential flooding and associated mold growth remains important for respiratory health.