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Batan, Aklan, Philippines, occupies a strategically important coastal position on the island of Panay, nestled within the Western Visayas region. Its coordinates (11.5853° N, 122.4981° E) place it on a relatively flat, low-lying plain bordering the Sibuyan Sea. The surrounding landscape is characterized by a gradual transition from coastal mangroves and sandy beaches to inland rice paddies and small-scale agricultural lands, primarily cultivating crops like rice, corn, and coconut. This urban–rural gradient is relatively gentle, with agricultural activity significantly influencing the immediate vicinity of Batan. The town’s elevation is minimal, rarely exceeding 10 meters above sea level, which contributes to a tendency for pollutants to accumulate, particularly during periods of low wind. While Batan itself lacks major industrial zones, it benefits from its proximity to Kalibo, the provincial capital, which hosts some light industrial activity and a bustling airport. This proximity means that emissions from Kalibo can occasionally impact Batan’s air quality. The town’s location along the coast also exposes it to maritime influences, including sea breezes that can disperse pollutants, but also introduce salt aerosols. The prevailing winds generally blow from the southwest during the wet season, bringing moisture and potentially carrying pollutants from other areas. The terrain’s flatness limits natural ventilation, making Batan susceptible to localized air quality issues, especially concerning agricultural burning practices common in the surrounding rural areas.

Batan’s tropical climate dictates a distinct wet and dry season, profoundly influencing its air quality. The wet season, typically spanning from June to November, brings frequent rainfall and increased humidity. While the rain generally helps to cleanse the atmosphere, periods of prolonged rainfall can lead to stagnant air and localized fog, trapping pollutants near the ground. Agricultural burning, a common practice for land clearing before planting, intensifies during the transition months (May and November), significantly degrading air quality with smoke and particulate matter. The dry season, from December to May, is characterized by lower rainfall and higher temperatures. During this period, particularly in March and April, temperature inversions can occur, where a layer of warm air sits above cooler air near the ground, preventing vertical mixing and trapping pollutants. Sea breezes, while generally beneficial for dispersion, can be weaker during the dry season, further exacerbating this issue. The months of April and May are generally the most challenging for air quality, with increased risk for individuals with respiratory conditions. During the wet season, the increased humidity can aggravate asthma and other respiratory ailments. Sensitive groups, including children, the elderly, and those with pre-existing respiratory or cardiovascular conditions, should limit prolonged outdoor exposure during periods of agricultural burning or when fog is present. Maintaining indoor air quality through proper ventilation and air filtration is also crucial throughout the year.