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Tigbauan, Iloilo, Philippines, occupies a strategically important coastal position on Panay Island, nestled within the Western Visayas region. Its coordinates (10.6747° N, 122.3776° E) place it on a gently sloping plain, transitioning from fertile agricultural lands inland to the expansive Guimaras Strait along its western boundary. The terrain is predominantly flat, facilitating agricultural activity, particularly rice cultivation and the growing of fruits like mangoes, a significant regional export. Tigbauan’s location within the Iloilo River Basin influences its microclimate and potential for localized flooding, which can temporarily impact air quality due to resuspended particulate matter. The surrounding landscape is a mosaic of rice paddies, coconut plantations, and small-scale farms, creating a distinct urban-rural gradient. While Tigbauan itself is a growing municipality, it isn't directly adjacent to major industrial belts; however, Iloilo City, a significant urban center and industrial hub, lies approximately 30 kilometers to the northeast. This proximity means Tigbauan can experience some degree of downwind pollution transport, particularly during periods of stagnant air. The elevation is relatively low, averaging around 10-20 meters above sea level, which can exacerbate temperature inversions and trap pollutants close to the ground. The Guimaras Strait provides a degree of natural ventilation, but its effectiveness is dependent on prevailing wind patterns. The municipality’s coastal location also makes it susceptible to saltwater intrusion, potentially affecting soil quality and indirectly influencing vegetation and air quality.

Tigbauan’s tropical climate dictates a wet and dry season pattern, significantly influencing its air quality dynamics. The wet season, typically spanning from June to November, brings frequent rainfall and increased humidity. While rain naturally helps to cleanse the atmosphere by scavenging pollutants, the associated increased agricultural activity—particularly the burning of rice straw after harvest—can lead to temporary spikes in particulate matter. The monsoon winds during this period generally provide good ventilation, dispersing pollutants relatively quickly, but localized burning events can still create short-term air quality concerns. The dry season, from December to May, is characterized by lower rainfall and higher temperatures. This period often sees a greater risk of temperature inversions, particularly during the early morning hours, where cooler air becomes trapped beneath a layer of warmer air, preventing vertical mixing and trapping pollutants near the ground. Fog, though infrequent, can also exacerbate this effect. The months of April and May, coinciding with the peak of the dry season and agricultural activities, are generally periods to exercise caution for those sensitive to air pollution. During these months, outdoor activities should be planned for times of the day when ventilation is typically better, such as mid-morning or afternoon. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should be particularly mindful of air quality and limit prolonged outdoor exposure during periods of stagnant air or visible haze. The prevailing winds from the southwest during the wet season generally help to flush out pollutants, while the weaker, more variable winds of the dry season can lead to more localized pollution build-up.