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Oxchuc, nestled within the highlands of Chiapas, Mexico, occupies a geographically significant position at approximately 16.78° N, 92.28° W. The city sits at an elevation of roughly 1,750 meters (5,740 feet) above sea level, contributing to a cooler climate compared to coastal regions of Mexico. Oxchuc’s terrain is characterized by steep slopes and valleys, typical of the Sierra Madre de Chiapas mountain range. This rugged landscape influences local wind patterns, often creating localized areas of stagnant air, particularly within the valley where the city is situated. The surrounding landscape is dominated by dense cloud forests and agricultural lands, primarily dedicated to coffee, maize, and beans – a vital component of the regional economy. The urban fabric of Oxchuc is a blend of traditional Mayan architecture and more modern construction, reflecting its rich cultural heritage and evolving demographics. The urban–rural gradient is relatively sharp; the city transitions quickly into agricultural fields and forested areas. While Oxchuc isn't directly adjacent to major bodies of water, it draws water from nearby springs and streams, impacting local ecosystems. There are no significant industrial belts immediately surrounding Oxchuc; however, the transportation of agricultural products via trucks contributes to localized emissions. The mountainous terrain and valley location combine to create conditions where pollutants can become trapped, especially during periods of low wind and temperature inversions, impacting air quality within the city limits.

Oxchuc’s tropical highland climate dictates a distinct wet and dry season pattern, profoundly influencing air quality. The dry season, generally from November to April, often sees a slight improvement in air quality due to increased wind speeds dispersing pollutants. However, this period also witnesses increased agricultural burning as farmers clear fields for planting, introducing particulate matter into the atmosphere. The wet season, from May to October, brings frequent rainfall, which naturally helps to cleanse the air by removing particulate matter. However, persistent fog, common during the wet season, can trap pollutants close to the ground, creating localized episodes of reduced visibility and potentially impacting respiratory health. Temperature inversions, where cooler air is trapped beneath warmer air, are more frequent during the cooler months (December-February), exacerbating pollution accumulation within the valley. During these periods, emissions from cooking fires, vehicle exhaust, and agricultural activities become more concentrated. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during periods of fog or temperature inversions, limiting outdoor activity and ensuring adequate ventilation. The increased agricultural burning during the dry season warrants particular attention, and residents should be aware of potential smoke exposure. While rainfall generally improves air quality, the intensity and frequency of storms can also temporarily disrupt it due to wind-blown dust and debris.