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Pantepec, nestled within the verdant highlands of Chiapas, Mexico, occupies a geographically significant position within the broader Lacandon Jungle region. Located at approximately 17.18° N, 93.05° W and an elevation of around 850 meters above sea level, the town experiences a subtropical highland climate. The surrounding landscape is dominated by steep, forested slopes, characteristic of the Sierra Madre de Chiapas mountain range. This terrain significantly influences local air circulation patterns; valleys can trap pollutants, while the slopes promote upslope and downslope winds, potentially dispersing or concentrating emissions. Pantepec’s proximity to dense agricultural zones, particularly those cultivating coffee, maize, and beans, introduces localized sources of particulate matter from agricultural burning, a common practice during land clearing and crop residue management. While not directly adjacent to major industrial belts, the town’s connection to regional transportation routes facilitates the movement of goods and vehicles, contributing to vehicular emissions. The urban–rural gradient around Pantepec is gradual, with small agricultural settlements interspersed within the forested landscape. The town itself exhibits a relatively low urban density, characterized by traditional housing and limited industrial activity. The presence of the Jaltepec River, though not a major waterway, provides a degree of humidity and influences local microclimates. The mountainous terrain and dense vegetation contribute to a generally cleaner air baseline, but localized agricultural practices and transportation remain key factors affecting air quality.

Pantepec’s air quality follows a distinct seasonal pattern dictated by its tropical highland climate, exhibiting a pronounced wet and dry season cycle. The dry season, typically spanning from November to April, often witnesses a noticeable increase in particulate matter. This is largely attributable to agricultural burning practices, intensified during this period to prepare fields for planting. Reduced rainfall and lower humidity during these months exacerbate the issue, as there is less natural cleansing of the atmosphere. Temperature inversions, common during the cooler nights of the dry season, can trap pollutants near the ground, further degrading air quality. Conversely, the wet season (May to October) brings frequent rainfall and higher humidity, naturally washing away particulate matter and diluting gaseous pollutants. Stronger prevailing winds associated with the monsoon-like patterns also aid in dispersion. Fog, particularly in the mornings during the transition periods between seasons, can temporarily reduce visibility and trap pollutants. The months of January and February often present the most challenging air quality conditions due to the combination of agricultural burning and temperature inversions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these periods, limiting outdoor exertion and monitoring for any adverse health effects. During the wetter months, outdoor activities are generally more favorable, although occasional periods of reduced visibility due to fog can still occur. Maintaining awareness of local agricultural practices and weather patterns is crucial for informed decision-making regarding outdoor exposure.