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Chilcuautla, Hidalgo, nestled within the Mexican highlands, occupies a geographically significant position within the Bajío region, a historically fertile and increasingly industrialized zone. Located at approximately 20.3333° N, 99.2333° W and an elevation of around 2150 meters (7,050 feet) above sea level, the city experiences a distinct high-altitude climate. The surrounding landscape is characterized by rolling hills and valleys, part of the broader Sierra de Pachuca range, impacting local wind patterns and air circulation. While Chilcuautla itself is a relatively small municipality, its proximity to the larger urban and industrial centers of Pachuca and the greater Mexico City metropolitan area exerts a considerable influence. The urban–rural gradient transitions rapidly, with agricultural lands – primarily maize and vegetable cultivation – dominating the immediate periphery. This agricultural activity, while vital to the local economy, can contribute to particulate matter pollution, particularly during planting and harvesting seasons. Further afield, the expanding industrial belt stretching towards Mexico City introduces emissions from manufacturing and transportation. The lack of significant bodies of water within immediate proximity limits natural air purification processes, and the topography can trap pollutants, especially during periods of atmospheric stability. The valley setting, combined with the elevation, can exacerbate temperature inversions, a key factor in air quality degradation. The region's geology, with volcanic soils, also influences the dispersion of airborne particles.

Chilcuautla’s air quality follows a distinct seasonal pattern dictated by its highland climate and regional meteorological influences. The dry season, typically spanning from November to April, often presents the most challenging conditions. Reduced rainfall and lower humidity contribute to a build-up of particulate matter, exacerbated by agricultural burning practices in surrounding rural areas. Temperature inversions are more frequent during these months, trapping pollutants close to the ground, particularly in the mornings and evenings. The months of December and January often see the poorest air quality due to a combination of these factors. The wet season, from May to October, brings relief as rainfall washes away pollutants and increased humidity helps to settle particulate matter. However, periods of intense rainfall can also lead to increased mold and fungal spores, impacting respiratory health. Wind patterns, generally prevailing from the north during the dry season, can carry pollutants from industrial zones to the south, including those originating from the Mexico City area. Fog, common during the cooler months, further restricts air movement and concentrates pollutants. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, limiting outdoor activity during peak pollution periods. Maintaining indoor air quality through ventilation and air purification can also be beneficial. During the wet season, those with allergies should monitor pollen and mold levels.