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Nabua, Camarines Sur, Philippines, occupies a strategically important position within the Bicol Region, nestled on the southeastern flank of Mount Isarog, a dormant volcano. Its coordinates (13.4083, 123.3750) place it within a gently sloping coastal plain transitioning into the foothills of the mountain range. The municipality benefits from proximity to the Partido and San Miguel bays, influencing local weather patterns and providing access to marine resources. The surrounding landscape is a mosaic of rice paddies, coconut plantations, and small-scale agricultural plots, characteristic of the rural Bicol landscape. Nabua’s urban character is primarily provincial, with a central market area and residential zones radiating outwards. The urban–rural gradient is relatively smooth, with agricultural land quickly enveloping the built environment. Mount Isarog’s presence significantly impacts local topography, creating localized microclimates and influencing drainage patterns. While Nabua isn't directly adjacent to major industrial belts, it’s within reasonable distance of industrial activity in Naga City and other regional hubs, potentially contributing to transboundary pollution. The elevation varies, generally ranging from 10 to 30 meters above sea level closer to the coast, rising gradually towards the foothills. This terrain, combined with prevailing winds from the Pacific Ocean, dictates the dispersal of pollutants, with potential for stagnation during periods of low wind speed and temperature inversions. The fertile volcanic soil supports intensive agriculture, which, while vital to the local economy, can also contribute to localized air quality concerns through the use of fertilizers and occasional agricultural burning.

Nabua’s tropical climate dictates a wet and dry season pattern, profoundly influencing air quality dynamics. The dry season, typically spanning from November to May, often sees a slight improvement in air quality due to reduced rainfall and increased sunlight, which aids in pollutant dispersion. However, this period can also experience periods of stagnant air, particularly during temperature inversions, where cooler air becomes trapped beneath a layer of warmer air, preventing vertical mixing and concentrating pollutants near the ground. Agricultural burning, a common practice for land clearing and crop residue disposal, is most prevalent during the transition from the wet to dry season (October-November), leading to noticeable spikes in particulate matter. The wet season (June to October), characterized by the southwest monsoon (Habagat), brings frequent rainfall and increased humidity. While rainfall naturally helps to cleanse the atmosphere, the monsoon winds can also transport pollutants from distant sources, potentially impacting air quality. Fog, a relatively common occurrence during the wet season, can trap pollutants, exacerbating localized air quality issues. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during periods of agricultural burning and when fog is present. During the dry season, prolonged exposure to direct sunlight can also exacerbate respiratory issues, necessitating shade and hydration. The interplay of monsoon winds, temperature inversions, and agricultural practices creates a complex seasonal narrative for Nabua’s air quality, demanding adaptive strategies for public health.