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Calubian, nestled on the western coast of Leyte Island in the Philippines, presents a unique geographic context influencing its air quality. Situated at 11.4467°N, 124.4278°E, the municipality’s terrain is characterized by a coastal plain rising gently inland, punctuated by rolling hills. This proximity to the Camotes Sea is a defining feature, providing both economic opportunities through fishing and potential for sea breeze circulation, which can disperse pollutants. However, this coastal location also renders Calubian vulnerable to maritime air masses carrying pollutants from regional sources. The surrounding landscape is predominantly agricultural, with rice paddies and coconut plantations dominating the rural areas. While Calubian isn’t a major industrial hub, the presence of smaller-scale agricultural processing and potential emissions from nearby municipalities contribute to the local air quality profile. The urban-rural gradient is relatively sharp, with the town proper concentrated along the coastal highway. Deforestation in the surrounding hills, a common issue in Leyte, can exacerbate erosion and dust levels, impacting air quality, particularly during the dry season. The relatively low elevation minimizes temperature inversions, but localized effects can still occur. Understanding these geographical factors is crucial for assessing and mitigating air pollution in Calubian.

Calubian experiences a distinct wet and dry season, profoundly impacting air quality. The dry season, typically from February to May, sees a peak in particulate matter due to increased dust from agricultural activities, road traffic, and potential open burning. Lower rainfall means less atmospheric cleansing, and stable atmospheric conditions can trap pollutants. March and April are generally the months with the poorest air quality. Conversely, the wet season, spanning June to November, brings significant improvements. Monsoon rains effectively wash away pollutants, and higher humidity reduces dust suspension. However, the wet season also brings increased potential for mold and fungal spores, which can affect respiratory health. December and January represent a transitional period, with generally favourable air quality. The northeast monsoon, prevalent during these months, brings cleaner air from the Pacific Ocean. Sensitive groups – children, the elderly, and those with respiratory conditions – should exercise caution during the dry season, limiting outdoor activity during peak hours. Monitoring wind direction is key; winds from the west can carry pollutants from neighbouring areas. Staying indoors during dust storms and utilizing air purifiers are recommended preventative measures.