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Pinili, Ilocos Norte, Philippines, occupies a geographically significant position on the western coast of Luzon Island, approximately 330 kilometers north of Manila. Its coordinates, 17.9540° N, 120.5270° E, place it within a predominantly coastal plain characterized by gently rolling hills and agricultural lands. The municipality borders the South China Sea, influencing local weather patterns and providing a crucial source of livelihood through fishing and salt production. The terrain is generally flat, facilitating agricultural activities, primarily rice cultivation and corn farming, which dominate the surrounding landscape. Pinili’s urban character is distinctly rural, with a small poblacion (town center) and dispersed barangays (villages) largely dependent on agriculture. The urban–rural gradient is gradual, transitioning seamlessly from cultivated fields to residential areas and then to the coastline. The proximity to the Ilocos Norte inland agricultural belt means that agricultural burning, a common practice during land preparation, can contribute to localized air pollution events. Elevation is relatively low, averaging around 10-20 meters above sea level, minimizing the potential for significant topographic influences on air flow. The prevailing winds, often influenced by the monsoon seasons, play a crucial role in dispersing pollutants, though stagnant conditions can occasionally lead to localized build-up, particularly near agricultural areas or during periods of reduced wind speed. The coastal location also means that sea spray and salt aerosols are a constant component of the local atmosphere.

Pinili’s tropical climate dictates a wet and dry season pattern, significantly impacting air quality dynamics. The dry season, typically from November to May, often sees a slight improvement in air quality due to reduced rainfall and less moisture in the atmosphere. However, this period also coincides with increased agricultural burning as farmers prepare fields for the planting season, leading to periods of elevated particulate matter. The wet season, from June to October, brings frequent rainfall and higher humidity, generally cleansing the atmosphere and reducing particulate pollution. Monsoon winds during this period can also help disperse pollutants, although heavy fog, particularly in the early morning, can trap pollutants near the ground, creating localized pockets of poorer air quality. Temperature inversions, though less frequent than in temperate climates, can occasionally occur during cooler nights, trapping pollutants closer to the surface. The months of April and May are particularly noteworthy due to the combination of dry conditions and widespread agricultural burning. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit prolonged outdoor activity during these periods, especially during the early morning hours when fog is prevalent. During the wet season, while overall air quality is generally better, individuals with allergies may experience increased discomfort due to high humidity and pollen levels. Maintaining indoor air quality through proper ventilation and air purification is advisable throughout the year.