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Jalpa de Méndez, nestled within the state of Tabasco in southeastern Mexico, occupies a low-lying position within the vast Gulf Coastal Plain. Situated at coordinates 18.1764, -93.0631, the city’s terrain is predominantly flat, characteristic of its alluvial origins. The surrounding landscape is dominated by the extensive Tabascan rainforest, a humid tropical ecosystem, and agricultural lands dedicated primarily to the cultivation of crops like corn, beans, and increasingly, oil palm. The city is intimately connected to the network of rivers and waterways that define Tabasco, being relatively close to the San Pedro and Cárdenas rivers, which act as both transportation routes and potential conduits for pollutants. While not a major industrial hub itself, Jalpa de Méndez is influenced by industrial activity further upriver and along the Gulf coast. The urban-rural gradient is relatively sharp; the city centre gives way quickly to agricultural fields and dense forest. This proximity to both agricultural practices – involving potential pesticide and fertilizer runoff – and the humid rainforest environment significantly influences local air quality. The lack of significant elevation limits atmospheric dispersion, trapping pollutants closer to the ground, particularly during periods of calm weather. The city’s position within a tropical climate means high humidity and consistent temperatures play a key role in pollutant behaviour.

Air quality in Jalpa de Méndez follows a distinct seasonal pattern dictated by the region’s tropical climate, primarily a pronounced wet and dry season. The dry season, typically from February to May, sees a peak in particulate matter pollution. Reduced rainfall means less atmospheric cleansing, and agricultural burning for land preparation becomes more common, releasing significant smoke and ash. Dust from unpaved roads also contributes. Temperatures rise during this period, potentially exacerbating ozone formation. Conversely, the wet season, spanning June to November, generally brings improved air quality. Frequent and heavy rainfall effectively washes pollutants from the atmosphere. However, the increased humidity can also foster mold growth, impacting indoor air quality. December and January represent a transitional period with moderate conditions. Wind patterns, often influenced by regional weather systems, play a crucial role; northerly winds can bring cleaner air, while stagnant conditions trap pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should be particularly cautious during the dry season, limiting strenuous outdoor activity. Monitoring local conditions and staying indoors during peak pollution times is advisable. Fog, common in the early mornings, can trap pollutants near ground level.