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Manabo, a small municipality nestled in the province of Abra, Philippines, occupies a geographically significant position within the Cordillera Administrative Region. Located at approximately 17.43° N, 120.70° E, and with an elevation averaging around 1,400 meters (4,593 feet) above sea level, the city’s terrain is characterized by steep slopes and rugged mountains, typical of the Cordillera range. This mountainous landscape significantly influences local air circulation patterns. Manabo sits within a predominantly rural setting, surrounded by agricultural lands primarily dedicated to rice and corn cultivation, alongside smaller plots used for vegetable farming. The surrounding landscape is a mosaic of terraced fields clinging to the hillsides, interspersed with pine forests at higher elevations. While Manabo itself is a small urban center, it’s part of a broader regional network connected by winding mountain roads. The nearest substantial urban area is Bangued, the provincial capital, located a short distance away. The urban–rural gradient is sharp; the municipality transitions quickly from a small town center to agricultural fields and forested slopes. The lack of major industrial zones within Manabo itself reduces direct industrial emissions. However, agricultural practices, including the burning of crop residues after harvest, can contribute to localized air pollution events. The prevailing winds, often channeled through the mountain valleys, can either disperse pollutants or trap them, depending on the atmospheric conditions. The relatively high elevation and the surrounding forests generally contribute to cleaner air compared to lowland urban centers, but localized factors can still impact air quality.

Manabo’s tropical climate dictates a distinct wet and dry season, profoundly impacting its air quality. The dry season, typically spanning from November to April, often sees a slight improvement in air quality due to reduced rainfall and lower humidity. However, this period also coincides with the agricultural burning season, as farmers clear fields for the next planting cycle. This practice releases significant particulate matter into the atmosphere, creating localized haze and potentially impacting respiratory health. Temperature inversions, common during the cooler nights of the dry season, can trap pollutants near the ground, exacerbating the effects of agricultural burning. The wet season, from May to October, brings frequent rainfall and higher humidity. The rain effectively ‘washes’ pollutants from the air, leading to a noticeable decrease in particulate matter. However, periods of prolonged rainfall can also lead to increased dampness and the growth of mold, which can affect indoor air quality. Monsoon winds, particularly during the peak of the wet season, can bring moisture and occasionally dust from neighboring regions. Fog, common at higher elevations like Manabo, can also trap pollutants, reducing visibility and potentially increasing exposure. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should be particularly cautious during the agricultural burning season (December-February) and during periods of dense fog. Outdoor activities are generally more favorable during the wet season, but awareness of potential mold issues indoors is crucial.