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Luna, Isabela, Philippines, nestled within the Cagayan Valley region, occupies a geographically significant position at approximately 16.97° N, 121.73° E. The city’s terrain is predominantly characterized by gently rolling hills and alluvial plains, a direct consequence of its location along the Magat River, a major tributary of the Cagayan River system. This riverine influence shapes the landscape, creating fertile agricultural lands that dominate the surrounding area. Luna sits at a relatively low elevation, averaging around 150 meters above sea level, which contributes to a generally stable atmospheric layer, though it can also exacerbate ground-level pollutant accumulation under certain conditions. The urban character of Luna is primarily rural-agricultural, with a small, concentrated urban core. The surrounding landscape is a patchwork of rice paddies, cornfields, and smaller farms, representing a strong urban–rural gradient. While Luna itself doesn't sit directly within a major industrial belt, it’s within reasonable proximity to industrial zones further north in Cagayan de Oro, and the agricultural practices—particularly fertilizer use and occasional field burning—contribute to localized air quality concerns. The prevailing winds, generally easterly, influence the dispersal of pollutants, but can also carry agricultural emissions into the city. The proximity to the Magat River also introduces humidity, which can affect the behaviour of particulate matter and gaseous pollutants. The relatively flat topography limits natural ventilation, potentially trapping pollutants during periods of low wind speed.

Luna’s tropical climate dictates a distinct wet and dry season, profoundly impacting its air quality profile. The dry season, typically spanning November to May, often sees a slight improvement in air quality due to reduced rainfall and lower humidity. However, this period also witnesses increased agricultural activity, including the application of fertilizers and, regrettably, occasional instances of field burning to clear land for planting. These practices release particulate matter and nitrogen oxides, contributing to localized pollution spikes. The wet season, from June to October, brings frequent rainfall and high humidity. While the rain naturally helps to cleanse the atmosphere by scrubbing pollutants, the increased humidity can trap particulate matter closer to the ground, particularly during periods of fog or low wind. Monsoon winds, prevalent during the peak of the wet season, can either disperse pollutants or, conversely, transport them from surrounding agricultural areas into Luna. Temperature inversions, though less frequent than in temperate climates, can occur during cooler nights, trapping pollutants near the surface. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during periods of agricultural burning, which typically occur in the late dry season and early wet season. Outdoor activities are generally more favourable during the drier months, but vigilance regarding agricultural practices remains crucial. The combination of humidity and agricultural emissions creates a unique air quality challenge, requiring ongoing monitoring and mitigation strategies.