Dumangas Air Quality Index (AQI)

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Dumangas, Iloilo, Philippines, occupies a strategically important coastal position on Panay Island, nestled within the Visayas region. Its coordinates (10.8300° N, 122.7200° E) place it on a gently sloping plain bordering the Guimaras Strait, a significant waterway connecting Iloilo to the island of Guimaras. The terrain is predominantly flat, facilitating agricultural activity, with a gradual rise inland towards the central highlands of Iloilo. This low elevation, coupled with its coastal location, significantly influences Dumangas’ air quality. The surrounding landscape is a mosaic of rice paddies, coconut plantations, and small-scale farms, characteristic of the rural-urban gradient prevalent in the Philippines. While Dumangas itself is a municipality, it’s part of the broader Iloilo metropolitan area, experiencing increasing urbanization and associated pressures. The proximity to Guimaras Strait means that prevailing winds often carry maritime influences, but also potential pollutants from shipping activity and industrial zones further up the Iloilo coastline. The municipality’s location within a fertile agricultural belt means that seasonal burning practices, while vital for land preparation, can contribute to localized air pollution episodes. The urban character is primarily residential and agricultural, with limited heavy industry, though the increasing use of vehicles and small-scale businesses contributes to localized emissions. The relatively open terrain allows for some dispersion of pollutants, but also makes the municipality susceptible to intrusions from regional air quality events.

Dumangas’ tropical climate dictates a distinct wet and dry season, profoundly impacting its air quality. The dry season, typically spanning November to May, often sees a slight increase in particulate matter due to agricultural burning practices. Farmers clearing fields for the planting season utilize controlled burns, which, while traditional, release smoke and soot into the atmosphere. The prevailing northeast monsoon (Amihan) during this period can sometimes bring cleaner air from the Visayan Sea, but its influence is often localized. The wet season (June to October), characterized by the southwest monsoon (Habagat), brings frequent rainfall and increased humidity. This generally leads to a reduction in particulate matter as precipitation washes pollutants from the air. However, periods of prolonged rainfall can also lead to stagnant air conditions, particularly in low-lying areas, potentially trapping pollutants released from local sources. Fog, though infrequent, can exacerbate this effect, creating a layer of cool, moist air that inhibits dispersion. During the transition months (May/June and October/November), the shifting monsoon patterns can lead to unpredictable air quality fluctuations. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly when agricultural burning is prevalent. Limiting outdoor activity during periods of visible smoke is advisable. The increased humidity during the wet season can sometimes trigger mold growth, impacting indoor air quality and potentially exacerbating allergies. Maintaining good ventilation and addressing moisture issues is crucial during this time.