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Cozumel, an island municipality in the state of Quintana Roo, Mexico, presents a unique geographic context for air quality. Located in the Caribbean Sea, approximately 20km off the Yucatán Peninsula’s eastern coast, its flat limestone terrain rises to a maximum elevation of only 15 meters. This low elevation and complete encirclement by water significantly influence local meteorological patterns and pollutant dispersion. Unlike mainland Mexican cities burdened by extensive industrial belts, Cozumel’s economy is heavily reliant on tourism, with a smaller contribution from fishing and limited agriculture – primarily small-scale fruit and vegetable farming. The surrounding waters of the Mesoamerican Barrier Reef System, the second largest in the world, play a crucial role in moderating temperatures and influencing wind patterns. The island’s urban character is a blend of a historic downtown (San Miguel) and expanding tourist resorts. The urban-rural gradient is relatively sharp, with the southern and eastern portions of the island remaining largely undeveloped, covered in coastal scrub and mangrove forests. However, increased construction related to tourism and a growing population are altering this gradient. The constant sea breezes generally aid in dispersing pollutants, but localized concentrations can occur, particularly in areas with high traffic density and construction activity. The island’s isolation means pollutants are less likely to be transported *to* Cozumel from mainland sources, but local emissions are more concentrated.

Cozumel experiences a distinct wet and dry season, rather than traditional four seasons, profoundly impacting air quality. The dry season, from February to April, sees consistently high temperatures and lower humidity, coupled with generally stable atmospheric conditions. This can lead to localized build-up of pollutants from vehicle exhaust and construction dust, particularly in San Miguel. While sea breezes offer some relief, temperature inversions can occasionally trap pollutants near the surface. The wet season, spanning May to October, brings increased rainfall and higher humidity, effectively scouring the atmosphere and improving air quality. However, intense rainfall can also lead to increased runoff, carrying pollutants into coastal waters. September and October, coinciding with the peak of the Atlantic hurricane season, often experience strong winds that further disperse pollutants. November and January are generally the most favourable months for outdoor activities, with pleasant temperatures and moderate breezes. Sensitive groups – individuals with respiratory conditions, the elderly, and young children – should exercise caution during the dry season, limiting strenuous outdoor activity during peak hours and monitoring any respiratory symptoms. The increased humidity during the wet season can also exacerbate respiratory issues for some.