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Barugo, Leyte, nestled on the eastern coast of the Philippines, occupies a geographically significant position within the Visayas region. Located at approximately 11.32° N, 124.73° E, the municipality’s terrain is characterized by a gently sloping landscape transitioning from coastal plains to rolling hills inland. Its elevation ranges from near sea level along the coastline to approximately 150 meters at its highest points, influencing local wind patterns and potential for temperature inversions. The municipality borders the Philippine Sea to the east, providing a constant source of maritime breezes, which can both disperse and, under certain conditions, trap pollutants. Surrounding Barugo is a mosaic of agricultural land, primarily dedicated to rice cultivation and coconut farming, interspersed with small-scale settlements. This agricultural zone contributes to potential particulate matter emissions, particularly during harvesting and land preparation. To the west, the landscape gradually rises towards the interior highlands of Leyte. The urban–rural gradient is relatively smooth, with Barugo itself exhibiting a mix of residential areas, small commercial establishments, and agricultural outposts. While not directly adjacent to major industrial belts, its proximity to Tacloban City, the regional hub, means it can be indirectly affected by industrial emissions transported by prevailing winds. The coastal location also makes Barugo vulnerable to sea salt aerosol deposition, which can impact air quality and visibility, especially during storms. The overall geography creates a complex interplay of factors influencing air quality, demanding localized monitoring and mitigation strategies.

Barugo’s tropical climate dictates a distinct wet and dry season, profoundly impacting its air quality profile. The dry season, typically spanning from November to May, often sees a slight improvement in air quality due to increased wind speeds and solar radiation, which aids in pollutant dispersion. However, agricultural burning, a common practice during land preparation for the planting season (February-March), can lead to temporary spikes in particulate matter. The wet season, from June to October, brings frequent rainfall and high humidity. While rain naturally scavenges pollutants from the atmosphere, the increased humidity can exacerbate respiratory issues for sensitive individuals. The monsoon season, particularly during August and September, brings strong winds and heavy downpours, generally improving air quality by flushing out accumulated pollutants. Fog, though infrequent, can occur during the cooler months (December-January), trapping pollutants near the ground and creating localized air quality concerns. Temperature inversions, where cooler air is trapped beneath warmer air, are less common but can occur during periods of calm weather, hindering vertical mixing and leading to pollutant accumulation. Outdoor activities are generally more favorable during the drier months, avoiding the increased humidity and potential for agricultural burning. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during periods of agricultural burning and when fog or temperature inversions are present, limiting prolonged outdoor exposure and considering the use of air-purifying masks.