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Dao, a municipality in the province of Capiz, Philippines, occupies a relatively low-lying coastal plain on the island of Panay. Situated at approximately 11.38°N latitude and 122.63°E longitude, its geography is defined by its proximity to the Sibuyan Sea. The terrain is generally flat, gradually rising inland towards the central Panay mountain range, though Dao itself remains largely at or near sea level. This coastal location significantly influences air quality; sea breezes can offer dispersion of pollutants, but also carry salt spray and potentially, pollutants from maritime activity. The surrounding landscape is a mix of agricultural land – primarily rice paddies and coconut plantations – and small-scale fishing communities. While Dao isn’t a major industrial hub, regional agricultural practices, including the burning of agricultural waste, contribute to particulate matter. The urban-rural gradient is pronounced, with denser settlement concentrated around the *poblacion* and decreasing density outwards towards agricultural areas. The municipality’s position within the broader Western Visayas region means it’s susceptible to regional haze events originating from other parts of the Philippines or even neighbouring countries during certain times of the year. The lack of significant topographical barriers allows for relatively easy pollutant transport.

Dao 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, impacting respiratory health. The habagat winds, while providing dispersion, can also bring in pollutants from other areas. The dry season (December to May) presents the most challenging air quality conditions. Reduced rainfall allows pollutants from agricultural burning, vehicle emissions, and domestic sources to accumulate. February to April are typically the driest months, and therefore the months when air quality is most likely to be poorer. Temperature inversions, where a layer of warm air traps cooler air near the surface, can exacerbate pollution during calm mornings in the dry season. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during these periods. Monitoring wind direction is crucial; winds from the west can carry pollutants from nearby agricultural areas. Avoiding peak hours for outdoor exercise and using masks when necessary are recommended.