President Roxas Air Quality Index (AQI)

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President Roxas, nestled in the province of Capiz on Panay Island, Philippines, occupies a low-lying coastal plain bordering the Sibuyan Sea. Its coordinates (11.4297, 122.9247) place it within a region characterized by relatively flat terrain, gently sloping towards the sea. The city’s urban character is typical of a Philippine municipality – a central *poblacion* surrounded by agricultural lands, primarily rice paddies and coconut plantations. This proximity to agricultural zones introduces potential sources of particulate matter from farming activities, including burning of agricultural waste. The surrounding landscape is dominated by coastal mangroves and shallow marine ecosystems. While President Roxas isn’t a major industrial hub, regional economic activity centers around fisheries and agriculture, with some small-scale processing facilities. The urban-rural gradient is quite sharp, transitioning rapidly from the town center to rural landscapes. This coastal location means the city is highly susceptible to sea breezes, which can both disperse and concentrate pollutants depending on atmospheric conditions. The prevailing winds, influenced by the monsoon seasons, play a crucial role in air quality. The relatively low elevation limits natural dispersion of pollutants, potentially exacerbating localized pollution events. The city’s position makes it vulnerable to impacts from regional haze events originating from other parts of the Philippines and potentially Indonesia during dry seasons.

Air quality in President Roxas follows a pattern dictated by the Philippines’ tropical climate, primarily defined by wet and dry seasons. The dry season, typically from November to May, sees a noticeable decline in air quality. Reduced rainfall means less atmospheric cleansing, allowing pollutants from agricultural activities – like rice stubble burning – and vehicle emissions to accumulate. The northeast monsoon (Amihan) brings cooler, drier air, but can also trap pollutants near the ground due to temperature inversions, particularly in the early mornings. February and March are often the months with the poorest air quality. The wet season, from June to October, offers significant improvement. Heavy rainfall effectively washes pollutants from the atmosphere, and increased humidity can suppress dust. However, flooding during intense rainfall events can mobilize pollutants from contaminated areas. The southwest monsoon (Habagat) brings frequent showers and strong winds, aiding dispersion. August and September, while wet, can experience localized flooding and associated pollution. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during peak dry season months and periods of intense rainfall. Monitoring wind direction is crucial; onshore winds can carry pollutants from nearby areas.