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Rizal, Cagayan, nestled within the fertile Cagayan Valley of the Philippines, presents a unique geographic context influencing its air quality. Located at approximately 17.8478°N, 121.3450°E, the municipality sits amidst a predominantly agricultural landscape, characterized by expansive rice paddies and cornfields. The terrain is generally flat, typical of alluvial plains formed by the Cagayan River, the longest river in the Philippines, which flows nearby. This proximity to the river, while vital for irrigation and livelihoods, can also contribute to humidity and potential for stagnant air masses. Rizal’s elevation is relatively low, increasing susceptibility to temperature inversions, a phenomenon trapping pollutants near the ground. The urban character of Rizal is largely rural, with a population of around 19,077, indicating limited heavy industrial activity within the municipality itself. However, the broader Cagayan Valley region experiences some industrial and mining operations further upstream, potentially impacting air quality through long-range transport of pollutants. The urban-rural gradient is pronounced, with air quality likely deteriorating closer to the limited commercial areas and transport routes. Agricultural practices, including seasonal burning of crop residue, represent a significant localised source of particulate matter. The surrounding Sierra Madre mountain range influences wind patterns, sometimes creating barriers to air dispersion.

Rizal, Cagayan experiences a distinct wet and dry season, profoundly impacting air quality. The dry season, typically from March to May, sees a peak in particulate matter pollution. This is largely due to increased agricultural burning as farmers prepare fields for planting, coupled with drier conditions facilitating dust suspension. Wind patterns during this period are often calmer, exacerbating pollutant concentration. Conversely, the wet season, spanning June to February, generally brings improved air quality. Frequent rainfall effectively washes away airborne particles, and increased humidity reduces dust. However, the monsoon winds, while cleansing, can also transport pollutants from other regions of Luzon. November to January often experience increased cloud cover and potential for temperature inversions, trapping pollutants despite the rainfall. Sensitive groups – children, the elderly, and those with respiratory conditions – should exercise caution during the dry season, limiting strenuous outdoor activity. The months of June to September, coinciding with the peak of the wet season, generally offer the most favourable conditions for outdoor pursuits. Fog can occur during the cooler months, potentially increasing respiratory irritation. Monitoring wind direction during monsoon events is crucial to understand pollutant sources.