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Nueva Era, nestled in the province of Ilocos Norte, Philippines, occupies a geographically significant position within the wider Luzon island arc. Located at approximately 17.92°N, 120.67°E, the municipality sits at a modest elevation, generally ranging from 50 to 150 meters above sea level, contributing to a relatively mild climate. The surrounding landscape is characterized by a blend of agricultural plains and gently rolling hills, typical of the Ilocos region. To the west, Nueva Era is bordered by the expansive South China Sea, influencing local weather patterns and providing a potential pathway for marine-borne pollutants, though typically diluted by the sea breeze. The municipality’s urban character is distinctly rural, with a predominantly agricultural economy centered on rice and corn cultivation, alongside smaller-scale farming of vegetables and fruits. This agricultural activity, while vital to the local economy, can contribute to localized air pollution through the use of fertilizers, pesticides, and occasional field burning practices, though these are generally managed under provincial regulations. The urban–rural gradient is gradual, with small settlements and farms seamlessly transitioning into the core municipality. There are no major industrial belts immediately adjacent to Nueva Era; however, larger industrial areas are located further south in the Ilocos region, potentially impacting air quality through long-range transport of pollutants. The prevailing winds, generally from the southwest during the wet season and northeast during the dry season, play a crucial role in dispersing or concentrating pollutants within the area.

Nueva Era’s tropical climate dictates a distinct wet and dry season pattern, significantly influencing air quality dynamics. The wet season, typically spanning from June to November, brings increased rainfall and humidity, generally leading to improved air quality as precipitation washes away particulate matter. However, monsoon rains can also introduce moisture and contribute to localized fog, particularly in the mornings, which can trap pollutants near the ground. The dry season, from December to May, often sees a slight increase in particulate matter due to reduced rainfall and increased agricultural activity, including occasional controlled burning of crop residues. Temperature inversions, though not as frequent as in colder climates, can occasionally occur during the cooler months (January-February), trapping pollutants in a layer near the surface, especially in the mornings. Wind patterns are crucial; the southwest monsoon brings moisture and can disperse pollutants, while the northeast monsoon can sometimes lead to stagnation, particularly if winds are light. The months of April and May, coinciding with the tail end of the dry season and the start of harvest, may experience slightly elevated levels of particulate matter due to agricultural practices. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should be mindful of potential localized pollution during these periods and limit prolonged outdoor exposure, especially during early morning hours when fog is prevalent. Maintaining awareness of local weather conditions and agricultural activities is key to minimizing exposure and protecting respiratory health.