Zarraga Air Quality Index (AQI)

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Zarraga, Iloilo, Philippines, occupies a strategically important position within the central Visayas region, nestled within the fertile plains of Panay Island. Located at approximately 10.82° N, 122.60° E, the municipality benefits from a relatively low elevation, averaging around 15 meters above sea level, contributing to a warm, humid climate characteristic of the Philippines. The surrounding landscape is predominantly agricultural, with rice paddies and interspersed coconut plantations dominating the rural areas. To the west, Zarraga borders the Guimaras Strait, a significant waterway influencing local weather patterns and providing a potential pathway for marine-borne pollutants, though typically diluted by the strait’s volume. The urban character of Zarraga is primarily rural-residential, with a growing commercial sector concentrated around the town center. While not a major industrial hub, the municipality is part of the broader Iloilo economic corridor, experiencing increasing vehicular traffic and some light industrial activity related to agricultural processing. The urban–rural gradient is gradual, with agricultural land seamlessly transitioning into residential areas. This proximity to agricultural zones means that seasonal burning practices, while traditionally employed for land clearing, can contribute to localized air pollution episodes. The prevailing winds, generally from the southwest during the wet season and northeast during the dry season, play a crucial role in dispersing or concentrating pollutants within the municipality. The flat terrain limits vertical mixing, potentially exacerbating ground-level pollution under certain meteorological conditions.

Zarraga’s tropical climate dictates a distinct wet and dry season, significantly influencing air quality patterns. The wet season, typically spanning from June to November, brings frequent rainfall and increased humidity. While the rain naturally helps to cleanse the atmosphere, the associated monsoon winds can also transport pollutants from neighboring areas, occasionally leading to hazy conditions. The dry season, from December to May, is characterized by lower rainfall and higher temperatures. During this period, particularly in March and April, agricultural burning for land preparation can become a significant contributor to particulate matter pollution, creating localized episodes of poor air quality. Temperature inversions, where a layer of warm air traps cooler air near the ground, are less frequent but can occur during the cooler months (December-February), leading to stagnant air and the concentration of pollutants. Fog, though not a common occurrence, can also trap pollutants, especially in the early morning hours. The months of April and May are generally considered periods to exercise caution for individuals with respiratory sensitivities, as agricultural burning is most prevalent. During the wet season, while overall pollution may be lower, the increased humidity can exacerbate respiratory issues for some. Sensitive groups, including children, the elderly, and those with pre-existing respiratory conditions, should monitor local conditions and limit outdoor activity during periods of elevated particulate matter or haze. Maintaining good ventilation indoors and avoiding exposure to smoke from agricultural burning are crucial preventative measures. It's advisable to consult with a healthcare professional for personalized advice regarding air quality and health.