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Claveria, Misamis Oriental, Philippines, occupies a strategically important location within Northern Mindanao, nestled at 8.6100° N, 124.8947° E. The municipality’s geography is characterized by a rolling terrain, transitioning from coastal plains along Macajalar Bay to gently sloping hills inland. This bay, a significant inlet of the Bohol Sea, influences local weather patterns and provides a pathway for potential pollutants. Claveria sits within a predominantly rural landscape, surrounded by agricultural lands – rice paddies, coconut plantations, and small-scale farms are common sights. To the west lies the urban sprawl of Cagayan de Oro City, the regional capital, creating a discernible urban–rural gradient. This proximity to a major urban center means Claveria is susceptible to secondary pollution drift, particularly from vehicular emissions and industrial activity concentrated in Cagayan de Oro. The elevation varies, generally ranging from sea level near the coast to approximately 200 meters inland, impacting air circulation and potential for temperature inversions. The surrounding landscape is dominated by lush tropical vegetation, which can act as a natural filter, but also contributes to background particulate matter from biomass burning during agricultural practices. The municipality’s location along the Mahinog River further shapes its microclimate and drainage patterns, influencing local humidity and potential for fog formation, which can trap pollutants. The overall topography and surrounding land use patterns significantly influence Claveria’s air quality, creating a complex interplay of natural and anthropogenic factors.

Claveria’s tropical climate dictates a wet and dry season pattern, profoundly impacting its air quality. The dry season, typically spanning from March to May, often sees a slight increase in particulate matter. This is largely attributable to agricultural burning practices as farmers prepare fields for planting, releasing smoke and ash into the atmosphere. While wind patterns are generally consistent throughout the year, the drier air during this period can exacerbate the impact of these emissions, as humidity levels are lower, reducing the ability of particles to settle. The wet season, from June to November, brings monsoon rains and significantly improved air quality. Frequent rainfall effectively ‘washes’ pollutants from the atmosphere, reducing both particulate and gaseous pollutants. However, periods of prolonged rainfall can also lead to localized flooding, potentially releasing contaminants from stagnant water sources. December to February represents a transitional period, with cooler temperatures and occasional fog, particularly in the mornings. These conditions can lead to temporary temperature inversions, trapping pollutants near the ground and creating localized pockets of poorer air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during agricultural burning season (March-May) and be mindful of potential fog-related pollution during the transitional months. Outdoor activities are generally best enjoyed during the wet season when air quality is typically at its best, though sudden downpours can still occur. The interplay of monsoon patterns, agricultural practices, and localized meteorological events shapes Claveria’s air quality throughout the year.