Roxas Air Quality Index (AQI)

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Roxas, nestled on the western coast of Palawan Island in the Philippines, presents a unique geographic context influencing its air quality. Situated at 10.3197°N, 119.3408°E, the city benefits from a coastal location along Honda Bay, a significant body of water that generally promotes air dispersion. However, this proximity also introduces the potential for saltwater aerosols. The terrain surrounding Roxas is characterized by rolling hills and low-lying plains, transitioning into the rugged interior of Palawan. The city itself is relatively compact, exhibiting a typical Filipino urban form with a central *poblacion* and expanding residential areas. While not heavily industrialized, Roxas serves as a regional trading hub for agricultural produce – primarily rice, corn, and coconuts – from the surrounding rural areas. These agricultural activities contribute to seasonal biomass burning, a key factor in local air pollution. The urban-rural gradient is relatively sharp, with agricultural land immediately bordering the city limits. The prevailing winds, influenced by the Southeast Asian monsoon, play a crucial role in pollutant transport and dispersion, often carrying emissions from nearby islands and potentially from larger urban centers further afield. The city’s elevation is low, increasing susceptibility to humidity and temperature inversions which can trap pollutants near the ground.

Roxas experiences a pronounced wet and dry season, dictating the annual air quality narrative. The dry season, typically from November to May, sees a peak in particulate matter due to increased agricultural burning for land preparation and crop residue disposal. Lower rainfall means less atmospheric cleansing, and stable atmospheric conditions can lead to pollutant build-up. February and March are often the months with the poorest air quality. The onset of the wet season, around June, brings significant improvements. Monsoon rains effectively wash pollutants from the atmosphere, and higher humidity can suppress dust. However, increased rainfall also leads to higher mold spore counts, potentially impacting respiratory health. August and September, the peak of the monsoon, generally offer the cleanest air. Temperature inversions, common during the calmer mornings of both seasons, can temporarily trap pollutants near ground level. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during the dry season, particularly in March and April. During the wet season, monitoring for mold and mildew is advisable. Wind patterns shift with the monsoon, influencing the direction of pollutant transport.