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Amatán, Chiapas, nestled within the highlands of southern Mexico, occupies a geographically significant position within the broader Chiapas region. Located at approximately 17.3667° N, -92.8167° W, the city sits at an elevation of roughly 1,500 meters (4,921 feet) above sea level, contributing to a cooler, more temperate climate compared to coastal areas. The surrounding landscape is dominated by the Sierra Madre de Chiapas mountain range, a rugged terrain characterized by steep slopes, dense cloud forests, and agricultural terraces. This mountainous topography significantly influences local air circulation patterns; valleys can trap pollutants, while higher elevations experience greater dispersion. Amatán’s proximity to the Grijalva River, though not directly adjacent, provides a regional water source and influences humidity levels. The urban fabric of Amatán is relatively compact, exhibiting a clear urban–rural gradient as one moves outwards. The immediate surroundings are primarily agricultural, with coffee plantations and small-scale farming being dominant land uses. Further afield, the landscape transitions into increasingly dense forest. While Amatán itself lacks major industrial zones, its regional position within Chiapas means it is indirectly affected by agricultural practices and potential emissions from larger industrial centers located further north. The prevailing winds, often channeled through the mountain passes, play a crucial role in dispersing or concentrating pollutants, making the city’s air quality highly sensitive to regional weather patterns and agricultural activity.

Amatán’s tropical highland climate dictates a distinct wet and dry season pattern, profoundly impacting air quality throughout the year. The dry season, typically spanning November through April, often sees a slight improvement in air quality due to increased wind speeds and solar radiation, which aids in pollutant dispersion. However, this period also coincides with the coffee harvest, leading to increased burning of agricultural waste, a significant source of particulate matter. The wet season, from May to October, brings frequent rainfall and higher humidity. While rain naturally helps to cleanse the atmosphere, persistent cloud cover and reduced wind speeds can create conditions conducive to temperature inversions, particularly during the early morning hours. These inversions trap pollutants near the ground, potentially exacerbating respiratory issues. Fog, common during the wet season, further reduces visibility and can concentrate pollutants. Months like June and September, with their higher rainfall and persistent cloud cover, are often periods when air quality is most likely to be affected. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during these months, limiting outdoor activity during periods of fog or reduced visibility. Agricultural burning, even outside the peak harvest months, can contribute to localized air quality issues. Awareness of wind direction and avoiding areas near active burning are advisable for all residents.