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Cortes, nestled in the heart of Bohol Island, Philippines, occupies a relatively inland position at coordinates 9.7200, 123.8800. The municipality’s terrain is characterized by gently rolling hills, typical of Bohol’s karst landscape, transitioning into flatter agricultural lands closer to the Loboc River, which forms a significant part of its western boundary. With a population of 18,344, Cortes maintains a predominantly rural character, though the town proper exhibits a growing urban core. Its location, approximately 45 kilometers from Tagbilaran City, Bohol’s capital, places it within a regional agricultural belt, primarily focused on rice cultivation and coconut farming. This agricultural activity, while vital to the local economy, contributes to seasonal biomass burning, a key factor influencing local air quality. The surrounding landscape is dominated by lush vegetation, interspersed with smaller settlements. The elevation is relatively low, generally below 100 meters above sea level, minimizing the potential for significant temperature inversions, but not eliminating them entirely. The urban-rural gradient is pronounced, with air quality generally deteriorating closer to the town center due to increased vehicular traffic and localized commercial activity. Proximity to the coast, while not immediate, means the municipality is susceptible to sea breezes that can either disperse or concentrate pollutants depending on prevailing wind conditions.

Air quality in Cortes, Bohol, follows a pattern dictated by the island’s distinct wet and dry seasons. The dry season, typically from February to May, sees a noticeable increase in particulate matter due to agricultural practices like land preparation and crop residue burning. Lower rainfall means pollutants are less effectively washed from the atmosphere, and stable atmospheric conditions can trap them. March and April are often the months with the poorest air quality. The onset of the wet season, around June, brings a significant improvement. Increased rainfall effectively scrubs the air, and higher humidity can suppress dust. However, the wet season, lasting until November, isn’t without its challenges. Increased cloud cover can lead to reduced sunlight, potentially exacerbating indoor air pollution from cooking with biomass fuels. December and January offer a transitional period, with generally good air quality. Sensitive groups – children, the elderly, and those with respiratory conditions – should exercise caution during the peak of the dry season. During biomass burning periods, limiting outdoor exertion and using appropriate respiratory protection is advisable. Monitoring wind direction is crucial; winds from agricultural areas will carry higher pollutant loads. The southwest monsoon, prevalent during the wet season, generally provides a cleansing effect, but can also transport pollutants from other regions.