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Tagana-an, nestled in the province of Surigao del Norte, Philippines, is a coastal municipality characterized by a dynamic interplay of land and sea. Situated at 9.6964°N, 125.5825°E, the town’s geography is defined by its proximity to the Philippine Sea, influencing both its climate and potential air quality challenges. The terrain is generally undulating, transitioning from low-lying coastal plains to slightly elevated inland areas. This relatively flat topography, combined with prevailing wind patterns, can contribute to localized pollutant concentration. Tagana-an’s urban character is largely rural, with a population of 17,323, indicating a less dense built environment compared to major metropolitan areas. However, the increasing prevalence of motorcycle transport, a common mode of transport in the Philippines, introduces a significant source of particulate matter and nitrogen oxides. Surrounding Tagana-an are areas of agricultural land, primarily dedicated to coconut and banana cultivation, with potential for seasonal burning contributing to particulate pollution. The municipality isn’t located near major industrial belts, lessening the impact of heavy industry, but small-scale fishing and related activities are prominent. The urban-rural gradient is fairly sharp, with immediate coastal areas showing more concentrated human activity and potential for localized pollution, while inland areas remain largely agricultural and forested. This coastal location means sea breezes play a crucial role in dispersing pollutants, but can also trap them under certain atmospheric conditions.

Tagana-an experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, typically from March to May, sees a peak in particulate matter due to increased agricultural burning for land preparation and drier conditions facilitating dust suspension. Lower rainfall means less atmospheric cleansing. This period is generally less favourable for those with respiratory sensitivities. The onset of the wet season, around June, brings relief as rainfall washes away pollutants, improving air quality. However, increased humidity can also foster mold growth, potentially exacerbating allergies. The peak of the wet season, July to September, often coincides with typhoons impacting the region. While heavy rainfall cleanses the air, strong winds can stir up dust and debris. October to November represents a transitional period, with fluctuating rainfall and moderate air quality. December to February generally offers the most favourable conditions, with cooler temperatures and consistent sea breezes aiding pollutant dispersion. During the *amihan* (northeast monsoon), prevailing winds from the Pacific Ocean bring cleaner air. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should exercise caution during the dry season and periods of intense agricultural activity, limiting strenuous outdoor activity and considering the use of masks.