Caba Air Quality Index (AQI)

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Caba, La Union, Philippines, occupies a strategically important coastal position on the western edge of Luzon Island. Situated at approximately 16.4316° N, 120.3446° E, the municipality benefits from its proximity to the South China Sea, a defining feature shaping its climate and influencing local air quality. The terrain is gently undulating, transitioning from coastal plains to low hills inland, with elevations rarely exceeding 150 meters. This relatively flat topography, combined with consistent sea breezes, generally promotes good air circulation, but can also trap pollutants under specific meteorological conditions. Caba lies within the broader Ilocos Region, an area characterized by a gradual urban–rural gradient. To the east, agricultural lands dominate, primarily cultivating rice and corn, while the west is defined by the coastline and burgeoning tourism sector. The nearby industrial belt centered around San Fernando, La Union, represents a potential source of air pollutants, though its direct impact on Caba is moderated by prevailing winds. The surrounding landscape is a mix of agricultural fields, small settlements, and the expansive ocean, creating a unique microclimate. The municipality’s location within a tropical monsoon climate means it experiences high humidity and rainfall, which naturally helps to cleanse the atmosphere, washing away particulate matter. However, seasonal shifts and localized conditions can still significantly impact air quality, particularly concerning fugitive emissions from agricultural practices and occasional industrial releases.

Caba’s air quality follows a distinct seasonal pattern dictated by the tropical monsoon climate. The wet season, typically spanning from June to November, brings frequent rainfall and high humidity, naturally suppressing air pollution. The consistent precipitation effectively ‘scrubs’ the atmosphere, removing particulate matter and gaseous pollutants. During these months, outdoor activities are generally favoured, although periods of dense fog, particularly in October and November, can temporarily reduce visibility and potentially trap moisture-laden pollutants close to the ground. The dry season, from December to May, presents a different scenario. While sunshine is abundant, the reduced rainfall and lower humidity can lead to a build-up of pollutants. Temperature inversions, common during the cooler months (January and February), trap cooler air near the surface, preventing vertical mixing and concentrating pollutants. Agricultural burning, a traditional practice for land clearing, can also contribute to elevated particulate matter levels during this period. March and April often see increased dust from nearby agricultural activities. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of stagnant air or agricultural burning. While generally good, air quality can fluctuate, and awareness of these seasonal trends is crucial for informed decision-making regarding outdoor exposure. The monsoon winds, when they arrive, provide a natural reset, dispersing accumulated pollutants and improving air quality.