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Carrascal, nestled in the province of Surigao del Sur, Philippines, occupies a geographically significant position along the eastern seaboard of Mindanao. Located at 9.3683° N, 125.9494° E, the municipality’s terrain is characterized by a mix of undulating hills and coastal plains, rising to elevations that influence local air circulation patterns. The city sits adjacent to the Philippine Sea, a major factor in its climate and potential for marine-borne pollutants, though these are generally less impactful than terrestrial sources. Carrascal’s surrounding landscape is dominated by lush tropical rainforest, transitioning to agricultural lands – primarily coconut and banana plantations – further inland. This agricultural activity, while vital to the local economy, can contribute to particulate matter through burning practices, particularly during land clearing and harvesting seasons. The urban–rural gradient is relatively sharp; Carrascal itself is a small municipality, and the immediate periphery is largely rural, with scattered settlements and farms. There are no major industrial belts directly adjacent to Carrascal, however, the broader Surigao del Sur region has some mining operations, and prevailing winds can occasionally carry pollutants from these distant sources. The coastal location also means the city is susceptible to sea breezes, which can disperse pollutants but also transport salt spray and aerosols. Topography plays a crucial role; the hills can trap pollutants, especially during periods of low wind, creating localized air quality challenges. The overall geography creates a complex interplay of factors affecting air quality, demanding localized monitoring and mitigation strategies.

Carrascal experiences a tropical climate with distinct wet and dry seasons, significantly impacting its air quality profile. The wet season, typically spanning from November to May, brings frequent rainfall and high humidity. While the rain naturally helps to cleanse the atmosphere by removing particulate matter, the increased humidity can exacerbate respiratory issues for sensitive individuals. The dry season, from June to October, is characterized by lower rainfall and higher temperatures. This period often sees a build-up of pollutants, particularly during agricultural burning activities associated with the harvest of coconut and banana crops. Stagnant air conditions, common during this time, can lead to localized pollution episodes. Temperature inversions, where cooler air is trapped beneath warmer air, are less frequent but can occur, further hindering pollutant dispersion. The monsoon winds, particularly the Habagat (southwest monsoon), can bring periods of cleaner air, but also introduce dust and aerosols from other regions. Fog, while infrequent, can trap pollutants close to the ground, reducing visibility and increasing exposure. During the dry season (July-September), outdoor activities should be carefully planned, especially for children, the elderly, and those with pre-existing respiratory conditions. Avoiding strenuous activity during midday heat and monitoring for any respiratory discomfort is advisable. The wet season, while generally cleaner, can still trigger allergies due to increased pollen and mold spores. Maintaining indoor air quality through ventilation and air purification can be beneficial throughout the year.