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Carles, a municipality in the province of Iloilo, Philippines, occupies a coastal position on the island of Panay. Situated at approximately 11.57°N latitude and 123.13°E longitude, the terrain is generally flat, typical of a coastal plain, with a gradual rise inland. The town directly borders the Visayan Sea, a significant body of water influencing local weather patterns and potentially dispersing some pollutants. Carles is renowned for its extensive mangrove forests and coral reefs, particularly around the Gigantes Islands, which lie offshore. While not heavily industrialized, the surrounding region features a mix of agricultural land – primarily rice paddies and coconut plantations – and small-scale fisheries. The urban-rural gradient is pronounced; Carles town proper represents a concentrated area of commerce and residence, quickly transitioning to rural landscapes dominated by agriculture and coastal ecosystems. This proximity to both marine and agricultural zones impacts air quality. Sea breezes can offer temporary relief from land-based pollutants, but agricultural practices, including seasonal burning for land preparation, can contribute to particulate matter. The lack of significant industrial activity within Carles itself mitigates some pollution sources, but regional transport and potential shipping emissions must be considered. The prevailing winds, influenced by the monsoon seasons, play a crucial role in pollutant dispersion.

Carles experiences a distinct wet and dry season, heavily influenced by the southwest monsoon (habagat) and the northeast monsoon (amihan). Air quality generally improves during the wet season (roughly June to November) as rainfall effectively washes particulate matter from the atmosphere. However, increased humidity can also foster mold growth, potentially impacting respiratory health. The southwest monsoon brings frequent rainfall and strong winds, dispersing pollutants effectively. The dry season (December to May) presents a greater challenge. Reduced rainfall allows pollutants from agricultural activities – particularly rice paddy burning after harvest in February/March – and potential regional transport to accumulate. February and March are typically the months with the poorest air quality. Temperature inversions, though less common than in larger urban centers, can occur during calm mornings in the dry season, trapping pollutants near the ground. Sensitive groups, including children, the elderly, and those with pre-existing respiratory conditions, should limit strenuous outdoor activity during these periods. The amihan winds, while generally cleaner, can occasionally carry dust from neighboring islands. Monitoring wind direction is key; onshore winds during the dry season are associated with poorer air quality. Avoiding outdoor exercise during peak heat hours also reduces exposure.