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Calabanga, nestled in the province of Camarines Sur in the Philippines, occupies a strategic position within the Bicol Region. Located at 13.7089°N, 123.2161°E, the municipality benefits from a relatively flat coastal terrain, gently sloping inland. This low elevation, averaging around 15 meters above sea level, makes it particularly vulnerable to both seasonal flooding and the impacts of coastal air masses. The city borders the Lagonoy Gulf, a significant body of water influencing local weather patterns and potentially contributing to salt spray and humidity, which can affect pollutant dispersion. Surrounding Calabanga are extensive agricultural lands, primarily dedicated to rice cultivation and coconut farming. While not heavily industrialized itself, the region experiences some industrial activity in nearby Naga City, which can contribute to regional background pollution levels. The urban-rural gradient is pronounced; the poblacion areas exhibit denser development, while the periphery remains largely agricultural. This mix creates localized variations in air quality, with potential for higher concentrations of particulate matter from agricultural practices and vehicle emissions in more populated zones. The prevailing winds, influenced by the Pacific Ocean and seasonal monsoon patterns, play a crucial role in transporting pollutants in and out of the area, impacting air quality dynamics.

Calabanga experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, typically from March to May, sees increased dust and particulate matter from agricultural activities and unpaved roads, exacerbated by stronger winds. This period often coincides with increased open burning for land preparation, further degrading air quality. Avoiding prolonged outdoor exertion during peak afternoon hours is advisable, particularly for individuals with respiratory conditions. The onset of the wet season, around June, brings relief as rainfall washes away accumulated pollutants. However, increased humidity can also trap pollutants closer to the ground. The peak of the wet season, July to September, often experiences typhoons, which, while cleansing the air temporarily, can disrupt infrastructure and lead to localized flooding, potentially releasing contaminants. October to November represents a transitional period with generally improved air quality. December to February offers the most favourable conditions, with cooler temperatures and reduced agricultural activity. Sensitive groups – children, the elderly, and those with pre-existing respiratory illnesses – should monitor conditions closely during the dry season and typhoon events, limiting outdoor exposure when possible.