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Tula de Allende, nestled in the state of Hidalgo, Mexico, occupies a strategically important location within the Mezquital Valley, approximately 80 kilometers north of Mexico City. Its coordinates, 20.0500° N, -99.3500° W, place it at an elevation of roughly 2,050 meters (6,726 feet) above sea level, contributing to a cooler climate compared to lower-lying regions. The surrounding landscape is characterized by a mix of semi-arid scrubland, agricultural fields, and gently sloping hills, transitioning into the higher, more rugged terrain of the Sierra de Pachuca to the east. The valley floor, where Tula de Allende resides, is largely flat, facilitating urban expansion but also influencing air circulation patterns. The city’s proximity to the industrialized corridor stretching north from Mexico City, including significant manufacturing hubs in Pachuca and Tizayuca, is a key factor in its air quality challenges. Dominant winds often carry pollutants from these industrial zones towards Tula. Agriculture, particularly maize and wheat cultivation, also contributes to localized air pollution through the use of fertilizers and occasional field burning practices. The urban–rural gradient is relatively sharp; the city quickly gives way to agricultural land and sparse settlements. The lack of significant bodies of water nearby limits natural air purification processes, and the valley's topography can trap pollutants, especially during periods of temperature inversion. The geological composition of the area, with volcanic soils, can also influence the deposition and resuspension of particulate matter.

Tula de Allende’s air quality exhibits a distinct seasonal pattern dictated by its climate and regional meteorological influences. The dry season, typically spanning from November through April, often witnesses the most concerning air quality conditions. During these months, reduced rainfall and lower humidity contribute to the accumulation of particulate matter and gaseous pollutants. Temperature inversions, common occurrences in the valley during the cooler nights, trap pollutants close to the ground, exacerbating the problem. The prevailing winds, while generally dispersing pollutants, can occasionally shift, bringing in emissions from nearby industrial areas. March and April often see increased agricultural activity, including fertilizer application and, in some instances, controlled burns, further impacting air quality. The wet season, from May to October, brings relief as rainfall washes away pollutants and increased humidity helps to settle particulate matter. However, even during the wet season, periods of stagnant air and fog can temporarily degrade air quality. October, in particular, can experience a resurgence of pollution as the dry season approaches. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak pollution episodes. Maintaining indoor air quality through proper ventilation and air filtration is also advisable. The transition months of May and October require vigilance, as weather patterns can be unpredictable, and pollution levels can fluctuate rapidly.