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Kanasín, Yucatán, Mexico, occupies a strategically important position within the broader Peninsular Gulf of Mexico region. Located approximately 30 kilometers north of Mérida, the state capital, it functions as a significant commercial and industrial hub for the northern Yucatán. The city’s geography is characterized by a relatively flat, low-lying terrain, typical of the Yucatán Peninsula, with an average elevation of just 10 meters above sea level. This flatness contributes to limited natural air circulation, potentially trapping pollutants under certain meteorological conditions. Kanasín sits within the broader Puuc region, known for its limestone bedrock and cenotes – sinkholes that are vital sources of groundwater. The surrounding landscape is a mosaic of agricultural land, primarily dedicated to henequen (sisal) cultivation, citrus groves, and maize farming, which can contribute to particulate matter through agricultural practices and seasonal burning. To the west, the landscape gradually transitions into more extensive scrubland and savanna. The proximity to Mérida, a rapidly growing urban center, means Kanasín is influenced by the larger metropolitan area’s industrial activity and transportation patterns. While not directly adjacent to a major river, the region’s extensive underground aquifer system influences local humidity and microclimates. The urban–rural gradient around Kanasín is relatively gradual, with smaller agricultural communities interspersed within the expanding urban footprint, impacting air quality through a combination of urban and rural pollution sources. The city’s location, while advantageous for trade, presents challenges in managing air quality due to its flat topography and regional agricultural activities.

Kanasín’s tropical climate dictates a distinct wet and dry season pattern, profoundly influencing its air quality. The dry season, typically spanning from November to April, is characterized by lower humidity and increased sunshine, but also a heightened risk of particulate matter pollution. Agricultural burning, a common practice for land clearing and crop residue disposal, intensifies during this period, releasing significant amounts of smoke and fine particles into the atmosphere. Wind patterns during the dry season can be variable, sometimes leading to stagnant air conditions, particularly during temperature inversions where cooler air becomes trapped beneath a layer of warmer air, preventing vertical mixing and concentrating pollutants near ground level. The wet season, from May to October, brings frequent rainfall and higher humidity, which naturally helps to cleanse the air by washing away particulate matter. However, heavy rainfall can also lead to increased levels of ozone, a secondary pollutant formed through photochemical reactions involving sunlight and nitrogen oxides. Fog, more common during the transition months (October-November), can trap pollutants close to the ground, temporarily reducing visibility and increasing exposure. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural burning or stagnant air. Limiting outdoor exertion and monitoring local air quality reports are advisable. The increased humidity during the wet season generally provides some relief, but ozone levels should still be considered, especially on sunny days.