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Pandan, Antique, nestled on the western coast of Panay Island in the Philippines, presents a unique geographic context influencing its air quality. Located at 11.7206°N, 122.0961°E, the municipality is characterized by a coastal plain transitioning rapidly into the rugged, mountainous interior of Antique province. This terrain significantly impacts air circulation, potentially trapping pollutants during periods of calm weather. The town directly borders the Sibuyan Sea, benefiting from prevailing winds that can disperse some emissions, but also susceptible to marine aerosols contributing to particulate matter. Pandan’s urban character is largely defined by its coastal settlement pattern, with a concentration of residences and businesses along the national highway. While not a major industrial hub, the surrounding areas feature agricultural activity – primarily rice farming and coconut plantations – which can contribute to seasonal biomass burning. The urban-rural gradient is steep; moving inland quickly reveals a predominantly agricultural landscape. The elevation rises quickly, creating localized microclimates. This combination of coastal proximity, mountainous terrain, and agricultural practices dictates the specific air quality challenges faced by Pandan, making it vulnerable to both local and regional pollution sources. Understanding these factors is crucial for effective air quality management.

Pandan, Antique experiences a pronounced wet and dry season, heavily influencing air quality. The dry season, typically from March to May, sees a peak in particulate matter due to increased agricultural burning for land preparation and drier conditions facilitating dust suspension. This period often coincides with lower wind speeds, exacerbating pollution. Temperatures rise, potentially leading to localized temperature inversions trapping pollutants near ground level. Conversely, the wet season, from June to February, generally brings improved air quality. Monsoon rains effectively wash away pollutants, and higher humidity reduces dust. However, intense rainfall can also lead to localized flooding and the spread of waterborne contaminants, indirectly impacting respiratory health. November to January often experience increased cloud cover and calmer winds, potentially leading to a build-up of pollutants despite the rainfall. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the peak of the dry season. Monitoring wind direction is crucial; onshore winds can carry pollutants from nearby areas. Overall, the wet season offers more favourable conditions for outdoor activities, but vigilance regarding water quality remains important.