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Tubao, La Union, nestled on the western coast of Luzon Island in the Philippines, occupies a geographically significant position within the Ilocos Region. Its coordinates (16.3500° N, 120.4200° E) place it within a gently sloping coastal plain, transitioning inland to rolling hills and eventually the foothills of the Cordillera Central mountain range. The municipality’s terrain is predominantly agricultural, characterized by rice paddies and interspersed with small-scale farms cultivating various crops. This agricultural activity, while vital to the local economy, contributes to potential particulate matter emissions, particularly during harvest seasons when burning of crop residue can occur. Tubao’s proximity to the South China Sea influences its climate and, consequently, its air quality. The prevailing winds from the sea often bring moisture and can disperse pollutants, but stagnant air conditions, especially during periods of high pressure, can lead to localized accumulation. The urban character of Tubao is relatively modest; it’s a developing municipality rather than a sprawling urban center. The urban–rural gradient is gradual, with residential areas blending seamlessly into agricultural landscapes. There are no major industrial belts directly within Tubao, though nearby towns may have light industrial activity. The surrounding landscape is dominated by agricultural fields and scattered settlements, with the distant mountains providing a scenic backdrop. Elevation varies slightly, generally ranging from 10 to 50 meters above sea level, which can influence local wind patterns and pollutant dispersion.

Tubao’s tropical climate dictates a distinct wet and dry season, significantly impacting its air quality profile. The dry season, typically spanning November to May, often sees a slight improvement in air quality due to increased wind speeds and solar radiation, which aids in pollutant dispersal. However, this period also coincides with agricultural burning practices, leading to spikes in particulate matter, particularly during the months of February and March when rice fields are cleared. The wet season, from June to October, brings frequent rainfall and higher humidity. While rainfall naturally helps to cleanse the atmosphere by scrubbing pollutants, the increased humidity can sometimes trap moisture and contribute to fog formation, especially in the mornings. This fog, combined with stagnant air conditions, can lead to localized reductions in visibility and potential accumulation of pollutants. Temperature inversions, though less frequent than in colder climates, can occasionally occur during the cooler months (December-January), trapping pollutants near the ground. Monsoon winds, particularly during the southwest monsoon (Habagat), generally bring cleaner air from the west, but can also carry dust and aerosols from distant sources. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should be mindful of agricultural burning periods and avoid prolonged outdoor activity during foggy mornings. During the dry season, monitoring local news for burn bans is advisable. The wet season’s humidity can exacerbate respiratory issues for some, so maintaining indoor air quality is important.