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Tagum, the capital city of Davao del Norte in the Philippines, occupies a strategic position in southeastern Mindanao, nestled between the Davao Gulf to the south and the rolling foothills of the Diwalwal mountain range to the north. Situated at approximately 7.45°N latitude and 125.81°E longitude, this urban hub lies at a modest elevation of around 20 meters above sea level, giving it a predominantly flat to gently undulating terrain that facilitates urban sprawl and agricultural expansion. The city's location along the Pan-Philippine Highway positions it as a vital transportation and commercial node connecting Davao City to the north with the agricultural heartlands of the Davao Region. Proximity to the Davao Gulf, about 30 kilometers to the south, influences local humidity and occasional sea breezes, but its inland setting means it lacks the strong coastal ventilation that mitigates pollution in seaside cities. Surrounding Tagum are extensive banana and coconut plantations, part of the region's agro-industrial belt, which contribute to biogenic emissions and occasional agricultural burning. The urban-rural gradient is pronounced, with the city center exhibiting dense development and traffic congestion, while peripheral areas blend into farmland and forested zones. This geography exacerbates air quality issues as pollutants from vehicles, small-scale industries, and agricultural activities accumulate in the relatively sheltered basin-like terrain, with limited natural dispersion mechanisms compared to more exposed coastal or mountainous locales.

Tagum experiences a tropical climate with distinct wet and dry seasons, shaping its air quality patterns throughout the year. During the dry season from December to May, pollution typically peaks, especially in March and April when temperatures rise and rainfall diminishes. These months see increased dust from unpaved roads, vehicle emissions, and occasional agricultural burning, compounded by light winds and potential temperature inversions that trap pollutants near the surface. Sensitive groups, such as those with respiratory conditions, should limit outdoor activities during midday when pollution concentrations are highest. The wet season from June to November brings relief, with monsoon rains from the southwest (Habagat) from June to September and northeast (Amihan) influences later, effectively scrubbing the air of particulates. However, humidity can foster mold spores and other allergens, and occasional fog in early mornings during cooler months may temporarily reduce visibility. October and November often represent the cleanest air periods, ideal for outdoor exercise, though typhoon remnants can cause short-term disruptions. Year-round, the city's equatorial location ensures consistent daylight and minimal temperature variation, but the lack of strong seasonal winds means pollution dispersion relies heavily on convective afternoon thunderstorms during the wet season. Residents are advised to monitor local weather reports for haze advisories during dry spells and to use air purifiers indoors when pollution levels are elevated.