Apalit Air Quality Index (AQI)

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Apalit, nestled in the heart of Pampanga province, Philippines, occupies a crucial position within the Central Luzon Plain. Its coordinates (14.9496, 120.7587) place it in a relatively low-lying area, averaging around 30 meters above sea level, contributing to limited natural air dispersion. The city is bisected by the Pampanga River, a major waterway that, while vital for irrigation and transport, can also trap pollutants during periods of low flow. Surrounding Apalit is a predominantly agricultural landscape, characterized by extensive rice paddies – a significant source of methane, a potent greenhouse gas, and particulate matter from burning agricultural waste. The urban-rural gradient is pronounced; the city centre exhibits denser development, with increasing vehicular traffic and small-scale industrial activity, while the peripheries remain largely rural. Proximity to larger urban centres like Angeles City and San Fernando City, and the capital region of Manila, means Apalit experiences spillover effects from their industrial emissions and transportation networks. The flat terrain and limited topographical features hinder the flushing of pollutants, exacerbating air quality challenges, particularly during calm weather conditions. The region’s susceptibility to flooding also contributes to the resuspension of particulate matter from saturated soils.

Apalit’s air quality follows a distinct wet and dry season pattern, dictated by the prevailing monsoon winds. The dry season, typically from November to May, witnesses a significant deterioration in air quality. Reduced rainfall leads to increased dust and particulate matter from agricultural activities and unpaved roads. Higher temperatures promote the formation of ground-level ozone, especially in areas with vehicle emissions. February to April are generally the worst months for outdoor activity, particularly for those with respiratory conditions. The southwest monsoon, arriving around June, brings much-needed relief. Increased rainfall effectively washes away pollutants, and higher humidity suppresses dust. However, the monsoon can also contribute to localised flooding, which can stir up sediment and organic matter, temporarily impacting air quality. September and October, as the monsoon weakens, can experience a transitional period with fluctuating conditions. Fog is common during the cooler months, trapping pollutants near the ground and reducing visibility. Sensitive groups – children, the elderly, and those with pre-existing respiratory illnesses – should limit strenuous outdoor activity during the dry season and monitor conditions closely during periods of fog.