Aguilar Air Quality Index (AQI)

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Aguilar, Pangasinan, nestled in the Ilocos Region of the Philippines, occupies a geographically significant position within the broader Luzon island landscape. Located at approximately 15.8899° N, 120.2379° E, the municipality sits on a gently sloping terrain, transitioning from coastal plains towards the foothills of the Zambales Mountains to the west. This gradual elevation change, averaging around 100-200 meters above sea level, influences local wind patterns and atmospheric stability. Aguilar’s proximity to the Lingayen Gulf, a large embayment of the South China Sea, introduces a maritime influence, moderating temperatures but also potentially trapping pollutants under certain meteorological conditions. The surrounding landscape is predominantly agricultural, characterized by rice paddies, cornfields, and interspersed fruit orchards – a typical rural-agricultural gradient common in Pangasinan. While Aguilar itself is a relatively small municipality with a population of approximately 45,100, it’s part of a larger regional economic network. The nearby industrial zones concentrated around Dagupan City, though not directly adjacent, can contribute to regional air pollution episodes transported by prevailing winds. The urban–rural gradient is distinct; Aguilar retains a largely rural character, with limited heavy industry, but its connection to larger urban centers means it’s not entirely isolated from external pollution sources. The terrain’s topography, combined with the coastal location and agricultural practices, creates a complex interplay of factors impacting local air quality, making it susceptible to both local and regional pollution events.

Aguilar’s tropical climate dictates a distinct wet and dry season, profoundly influencing its air quality profile. The dry season, typically spanning from November to May, often sees a slight increase in particulate matter due to agricultural burning practices – farmers clearing fields for the next planting season. While controlled burns are common, they can contribute to localized haze and reduced visibility. The prevailing northeast monsoon (Amihan) during this period generally brings cooler, drier air and can help disperse pollutants, but periods of stagnant air, particularly during calmer weather spells in March and April, can lead to temporary air quality degradation. The wet season (June to October), characterized by the southwest monsoon (Habagat) and frequent rainfall, generally improves air quality by ‘washing’ pollutants from the atmosphere. However, heavy rainfall events can also lead to increased humidity, which can exacerbate respiratory issues for sensitive individuals. Fog, a relatively infrequent occurrence but possible during the cooler months, can trap pollutants near the ground, creating localized pockets of poor air quality. Temperature inversions, where cooler air is trapped beneath warmer air, are less common than in temperate climates but can still occur, particularly during periods of calm weather, hindering vertical mixing and allowing pollutants to accumulate. Outdoor activities are generally more favorable during the wet season, particularly during and immediately after rainfall. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during agricultural burning periods and when fog or stagnant air conditions are present, limiting prolonged outdoor exposure.