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Badiangan, Iloilo, Philippines, occupies a strategically important position within the Western Visayas region, nestled on the southeastern slopes of the Aklan River basin. Its coordinates (10.9860° N, 122.5369° E) place it within a predominantly rural landscape transitioning gradually towards a more urbanized setting as it approaches Iloilo City, approximately 45 kilometers to the northeast. The terrain is characterized by rolling hills and agricultural plains, with elevations ranging from roughly 10 to 80 meters above sea level. This gentle topography influences local wind patterns and can contribute to localized air quality challenges. The municipality is bordered by the vast expanse of rice paddies and sugarcane fields, a dominant feature of the Iloilo landscape, which are significant sources of agricultural emissions, including methane and particulate matter from burning. The proximity to the Aklan River, though providing a vital water source, can also influence humidity levels, impacting the dispersion of pollutants. While Badiangan itself lacks major industrial zones, its location within the broader Iloilo province means it is indirectly affected by industrial activity concentrated closer to Iloilo City and along the Panay River. The urban–rural gradient is evident, with the town center exhibiting denser settlements and limited commercial activity, while the surrounding areas remain largely agrarian. The surrounding landscape, dominated by agricultural land and scattered forests, plays a crucial role in the natural filtration of air pollutants, though agricultural practices can also contribute to localized air quality concerns.

Badiangan’s tropical climate dictates a distinct wet and dry season, profoundly impacting its air quality profile. The dry season, typically spanning from November to May, often sees a slight increase in particulate matter concentrations. This is largely attributable to agricultural burning practices, as farmers prepare fields for the next planting season. While regulations exist, enforcement can be challenging, leading to temporary spikes in smoke and associated pollutants. The prevailing winds during this period, generally from the northeast, can either disperse these emissions or trap them in localized areas depending on topography. The wet season, from June to October, brings frequent rainfall and higher humidity, which naturally helps to cleanse the air by washing away particulate matter and absorbing gaseous pollutants. However, periods of prolonged rainfall can also lead to stagnant air conditions, particularly in low-lying areas, potentially trapping pollutants released from agricultural activities or occasional vehicle emissions. Fog, though infrequent, can exacerbate air quality issues by reducing atmospheric mixing. During the transition months (May and November), unpredictable weather patterns can lead to fluctuating air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural burning. Outdoor activities are generally more favorable during the wet season, although vigilance regarding potential stagnant air conditions is still advised. The interplay of monsoon patterns, temperature inversions (though less frequent than in temperate climates), and local agricultural practices shapes Badiangan’s air quality throughout the year.