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Puerto Jiménez, nestled in the Osa Peninsula of Costa Rica (8.5338° N, -83.4610° W), occupies a unique and ecologically sensitive position. The town itself is relatively low-lying, situated near the Golfo Dulce, a deep, fjord-like inlet of the Pacific Ocean. This proximity to the gulf influences local humidity and sea breezes, playing a role in air circulation patterns. The surrounding landscape is dominated by dense tropical rainforest, part of the globally significant Osa Conservation Area, a biodiversity hotspot. The terrain is rugged, characterized by steep hills and valleys, which can trap pollutants under certain meteorological conditions. The urban fabric of Puerto Jiménez is a blend of traditional Costa Rican architecture and more modern construction, reflecting its growth as a tourism hub and gateway to Corcovado National Park. While there isn't a large-scale industrial belt nearby, the region supports small-scale agriculture, primarily banana and palm plantations, and some timber harvesting, which can contribute localized emissions. The urban–rural gradient is relatively sharp; the town quickly transitions into dense rainforest. The peninsula’s isolation, while preserving its natural beauty, also means that air masses are less frequently flushed out by prevailing winds, potentially leading to pollutant accumulation. Elevation varies considerably within a short distance, with peaks rising to over 800 meters nearby, influencing local wind patterns and temperature inversions. The Golfo Dulce’s unique hydrodynamics also affect the dispersion of any pollutants released into the atmosphere.

Puerto Jiménez experiences a distinct wet and dry season, rather than the four traditional seasons, profoundly impacting air quality. The dry season, typically from December to April, sees reduced rainfall and increased sunshine, leading to lower humidity. While this might seem beneficial, the lack of rainfall means fewer natural cleansing events, allowing particulate matter to linger. Calm wind conditions are more frequent during this period, particularly in February and March, which can exacerbate pollutant trapping, especially in the lower-lying areas near the Golfo Dulce. Temperature inversions, where a layer of warm air sits above cooler air near the ground, are also more common, preventing vertical mixing and further concentrating pollutants. The wet season, from May to November, brings frequent rainfall, which effectively washes pollutants from the atmosphere. However, heavy downpours can also stir up dust and sediment, temporarily increasing particulate matter. Fog, common during the transition months (May and November), can trap moisture and pollutants close to the ground. Outdoor activities are generally best enjoyed during the wet season, particularly in June, July, and August, when rainfall is frequent but typically short-lived. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting strenuous outdoor activity during periods of calm winds and potential temperature inversions. Agricultural burning, though regulated, can occasionally occur during land clearing, contributing to short-term spikes in air pollution.