San Manuel Air Quality Index (AQI)

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San Manuel, Tarlac, nestled in the heart of Luzon Island, Philippines, occupies a geographically strategic position within the Central Luzon Plain. The municipality’s coordinates (15.7975, 120.6072) place it amidst a relatively flat terrain, characteristic of the region’s alluvial plains formed by ancient river systems. This flatness contributes to limited natural air dispersion. The surrounding landscape is predominantly agricultural, dominated by rice paddies and farmland, interspersed with pockets of residential and commercial development. San Manuel’s elevation is low-lying, increasing susceptibility to temperature inversions, a phenomenon trapping pollutants near the ground. While not directly coastal, the municipality is within reasonable proximity to the South China Sea, influencing humidity and occasional sea breezes. The nearby Tarlac City and the broader industrial corridor along the Subic-Clark-Tarlac Expressway (SCTEX) represent significant sources of potential air pollution, impacting San Manuel through regional transport. The urban-rural gradient is pronounced, with denser settlements concentrated around the town proper, transitioning to more dispersed agricultural land use further afield. This gradient affects localized pollution concentrations, with higher levels typically found in the town center. The Pampanga River also flows nearby, potentially influencing local microclimates and pollutant dispersion.

San Manuel, Tarlac, experiences a distinct wet and dry season, profoundly influencing its air quality. The dry season, typically from November to May, sees a peak in particulate matter pollution. Reduced rainfall means less atmospheric cleansing, and agricultural activities like land preparation and harvesting contribute dust and biomass burning emissions. March and April are often the most challenging months for respiratory health. Temperature inversions are also more frequent during the cooler, drier months, trapping pollutants. The onset of the wet season, around June, brings a significant improvement in air quality. Monsoon rains effectively wash pollutants from the atmosphere, and increased humidity suppresses dust. However, increased rainfall can also lead to localised flooding, potentially releasing pollutants from stagnant water sources. August and September, the peak of the monsoon, generally offer the cleanest air. November sees a transitional period, with decreasing rainfall and a gradual build-up of pollutants. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor exposure during the dry season and monitor conditions closely. During the wet season, while air quality improves, mould growth indoors can pose a health risk.