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Gitagum, Misamis Oriental, Philippines, occupies a strategically important location within the broader Northern Mindanao region. Situated at approximately 8.5956° N, 124.4054° E, the municipality rests on a gently sloping terrain, transitioning from coastal plains towards the foothills of the Macajalar Range. This range, a significant geographical feature, influences local weather patterns and contributes to the city’s microclimate. Gitagum’s proximity to Macajalar Bay, a large inlet of the Bohol Sea, introduces a maritime influence, moderating temperatures and occasionally bringing in sea breezes. The surrounding landscape is a mosaic of agricultural land, primarily dedicated to rice cultivation and fruit orchards, interspersed with small-scale plantations. This agricultural activity, while vital to the local economy, can contribute to localized air pollution through the use of fertilizers and occasional field burning, particularly during land preparation periods. The urban–rural gradient around Gitagum is relatively gradual; the municipality itself is a small, developing town, with rural agricultural areas extending outwards. While not directly adjacent to major industrial belts, Gitagum benefits from its position near Cagayan de Oro City, a regional urban center with industrial and commercial activity. This proximity means that Gitagum can be susceptible to transboundary air pollution events originating from Cagayan de Oro, especially during periods of stagnant air or temperature inversions. The elevation, averaging around 150 meters above sea level, further influences air circulation and dispersion patterns, potentially trapping pollutants under certain meteorological conditions.

Gitagum’s tropical climate dictates a wet and dry season pattern, significantly impacting air quality dynamics. The dry season, typically spanning from March to May, often sees a slight increase in particulate matter due to agricultural practices. Farmers may engage in controlled burning of crop residues to clear fields, releasing smoke and soot into the atmosphere. While regulations exist, enforcement can be challenging, leading to temporary spikes in air pollution. The wet season, from June to November, brings frequent rainfall and increased humidity. These conditions generally improve air quality by washing away pollutants and increasing atmospheric moisture, which can trap some pollutants but also facilitate their removal. However, periods of prolonged rainfall can also lead to stagnant air, particularly in low-lying areas, potentially trapping pollutants released from local sources. The monsoon season, a subset of the wet season, can bring strong winds that help disperse pollutants, but also introduce moisture and fog, which can exacerbate respiratory issues for sensitive individuals. November to February represents a transitional period, with decreasing rainfall and gradually increasing temperatures. This period can be characterized by periods of calm winds and temperature inversions, especially in the early morning hours, which can trap pollutants near the ground. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should be particularly cautious during these periods, limiting outdoor activity during peak pollution hours and ensuring adequate ventilation indoors. The combination of agricultural practices and occasional transboundary pollution from Cagayan de Oro necessitates vigilance regarding air quality throughout the year.