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Jacó, a vibrant coastal city in Puntarenas province, Costa Rica, is strategically positioned along the Pacific coastline at coordinates 9.6200, -84.6044. With a population of approximately 11,685, Jacó has transformed from a small fishing village into a major tourist destination and regional service centre. The city is nestled between the Pacific Ocean and the densely forested hills of the Central Pacific Conservation Area, creating a unique microclimate and influencing air quality. The terrain is characterized by a relatively flat coastal plain, rapidly rising into steep, verdant slopes. This topography can trap pollutants during periods of calm winds. While Jacó itself lacks heavy industry, the surrounding agricultural zones, particularly palm oil and banana plantations, contribute to potential particulate matter and pesticide drift. The urban-rural gradient is sharp; immediately inland lies extensive rainforest, while the coastal strip is dominated by tourism-related development. Proximity to the ocean provides a constant sea breeze, which generally disperses pollutants, but can also carry salt spray and marine aerosols. The city’s growth, driven by tourism, has increased vehicle traffic, a significant source of localised emissions. Understanding this interplay of geography and development is crucial for managing Jacó’s air quality.

Jacó experiences a distinct wet and dry season, heavily influencing air quality. The dry season, typically from December to April, sees lower rainfall and stronger Pacific winds. While these winds generally improve dispersion, they can also carry dust from drier inland regions, increasing particulate matter. February and March often experience the clearest air, making them ideal for outdoor activities. The transition months of May and November are characterized by fluctuating conditions and moderate air pollution. The wet season, from May to November, brings increased rainfall, which naturally scrubs the air of pollutants. However, increased humidity can also promote the formation of mold and allergens, impacting respiratory health. September and October, peak months for rainfall, generally have the best air quality due to thorough atmospheric cleansing. Temperature inversions, though less frequent than in mountainous regions, can occur during calmer periods, trapping pollutants near ground level. Sensitive groups – children, the elderly, and those with respiratory conditions – should be particularly cautious during the dry season and monitor their health. Avoiding strenuous outdoor activity during peak traffic hours is advisable year-round.