Leon Air Quality Index (AQI)

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Leon, Iloilo, nestled in the Western Visayas region of the Philippines, occupies a geographically significant position within the island of Panay. Located at approximately 10.7808° N, 122.3894° E, the municipality sits on gently rolling terrain, part of the larger Iloilo Plain, a fertile agricultural zone. The elevation is relatively low, averaging around 30-50 meters above sea level, contributing to a warm, humid climate and limited vertical mixing of air pollutants. Leon is surrounded by a mosaic of rice paddies, coconut plantations, and smaller farms, characteristic of the rural-urban gradient prevalent in the Philippines. The Guimaras Strait lies to the west, influencing local wind patterns and occasionally bringing in maritime influences. While not directly adjacent to a major river, several smaller waterways crisscross the municipality, impacting local humidity and microclimates. The proximity to Iloilo City, a regional hub and industrial center approximately 40 kilometers to the northeast, introduces a degree of indirect influence from urban and industrial emissions. The surrounding landscape is predominantly agricultural, with limited heavy industry within Leon itself, though agricultural burning practices during land preparation can contribute to localized air quality issues. The urban character of Leon is primarily rural, with a small central market area and residential zones, meaning that the primary sources of pollution are likely to be related to agricultural activities and vehicle emissions from local transport.

Leon's tropical climate dictates a distinct wet and dry season, profoundly influencing its air quality. The dry season, typically spanning from November to May, often sees a slight increase in particulate matter due to agricultural burning. Farmers clearing fields for the next planting season utilize controlled burns, which, while traditional, release smoke and pollutants into the atmosphere. Wind patterns during this period can be variable, sometimes leading to stagnant air conditions, particularly in the evenings, which exacerbate the impact of these burns. The wet season, from June to October, brings frequent rainfall and higher humidity, generally leading to improved air quality as precipitation washes away pollutants and increased moisture traps particulate matter. However, periods of prolonged rainfall can also lead to localized flooding, which can release mold spores and other allergens into the air. Temperature inversions, though less frequent than in temperate climates, can occasionally occur during the cooler months (December-February), trapping pollutants near the ground. Monsoon winds during the wet season typically bring relief, dispersing pollutants. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should be mindful of agricultural burning during the dry season and take precautions like wearing masks and limiting outdoor activity during periods of heavy smoke. The months of April and May, coinciding with peak agricultural clearing, are generally periods to be more cautious regarding outdoor air quality. During the wet season, monitoring for mold growth in homes is advisable.