Iriga City Air Quality Index (AQI)

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Iriga City, nestled in the heart of Camarines Sur, Philippines, occupies a unique and geographically complex position. Situated on the slopes of Mount Iriga, an active volcano, the city’s terrain is characterized by undulating hills and valleys, contributing to a microclimate that significantly influences air quality. Its coordinates (13.4231, 123.4122) place it within a region dominated by lush tropical rainforests and agricultural lands, creating a distinct urban–rural gradient. The city lies near the Bicol River, providing a vital water source and influencing local humidity levels. Surrounding Iriga are extensive rice paddies and coconut plantations, typical of the Bicol region’s agricultural landscape. While Iriga itself is a relatively compact urban center, it’s part of a broader regional economic network, with connections to Naga City and Legazpi City. This proximity to larger urban areas means it can be susceptible to transboundary pollution. The elevation, ranging from approximately 150 to 400 meters above sea level, plays a crucial role in air circulation patterns. The volcanic soil, while fertile, can also contribute to particulate matter in the air, particularly during dry periods. The surrounding mountains act as barriers, sometimes trapping pollutants and exacerbating localized air quality issues. The city’s location within a tropical climate zone, combined with its topography, creates a dynamic environment where air quality is constantly shaped by natural and anthropogenic factors.

Iriga City’s tropical climate dictates a wet and dry season cycle, profoundly impacting its air quality. The dry season, typically spanning from November to May, often sees a noticeable increase in particulate matter. Reduced rainfall means less atmospheric cleansing, and agricultural burning, a common practice for land preparation, releases significant amounts of smoke and pollutants into the air. Temperature inversions, more frequent during the cooler months (December-February), trap pollutants near the ground, leading to stagnant air and potentially poorer air quality. The monsoon season, from June to October, brings increased rainfall, which naturally helps to wash away pollutants and improve air quality. However, strong winds associated with typhoons can also stir up dust and debris, temporarily degrading air quality. Fog, common during the cooler months, can also trap pollutants, reducing visibility and impacting respiratory health. During the wet season, the higher humidity can exacerbate respiratory conditions for sensitive individuals. Outdoor activities are generally more favorable during the monsoon months, particularly July and August, when rainfall is abundant. However, those with asthma or other respiratory illnesses should remain vigilant during the dry season, limiting prolonged outdoor exposure and taking necessary precautions. Children and the elderly are particularly vulnerable and should be advised to avoid strenuous activity during periods of elevated particulate matter.