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Huehuetla, Puebla, nestled within the Sierra Norte de Puebla mountain range, occupies a geographically significant position in central Mexico. Located at approximately 20.1075° latitude and -97.6233° longitude, the town sits at an elevation of around 1,850 meters (6,070 feet) above sea level, contributing to a cooler climate compared to lower-lying regions. The surrounding landscape is dominated by steep slopes, dense pine and oak forests, and agricultural terraces, characteristic of the region's volcanic soil. Huehuetla’s terrain is rugged, influencing urban development which is largely constrained to flatter areas along the valley floor. The town’s proximity to the Hueyotlipan River, a tributary of the Atoyac River, provides a crucial water source but also introduces potential for localized humidity and fog formation, impacting air quality. While Huehuetla itself is a relatively small municipality with a population of around 18,803, it lies within a broader agricultural zone, with maize and bean cultivation being prevalent. The urban–rural gradient is sharp; the town transitions quickly into forested hillsides and small farming communities. Larger industrial centers are distant, located primarily in the Puebla metropolitan area, minimizing direct industrial pollution. However, agricultural practices, including the use of fertilizers and occasional controlled burns, and vehicle emissions from the limited road network, contribute to local air quality challenges. The mountainous terrain can also trap pollutants, particularly during periods of low wind speed, creating localized air quality issues.

Huehuetla’s air quality experiences a distinct seasonal pattern dictated by its subtropical highland climate. The wet season, typically from May to October, brings increased humidity and frequent rainfall, generally leading to improved air quality as precipitation washes away particulate matter. However, periods of prolonged rainfall can also result in increased mold and fungal spore concentrations, impacting respiratory health. The dry season, from November to April, presents a different set of challenges. Lower rainfall and reduced vegetation cover mean less natural scrubbing of pollutants. Temperature inversions, common during the cooler months (December-February), trap cold air in the valleys and prevent the vertical dispersion of pollutants, leading to stagnant air and potentially elevated concentrations of particulate matter and gases. Fog, frequently occurring during the dry season mornings, further exacerbates this issue by reducing visibility and trapping pollutants close to ground level. Agricultural burning, though regulated, can still occur during the dry season to clear fields for planting, contributing to short-term spikes in air pollution. March and April often see increased dust from agricultural activities and road traffic. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during these months, particularly on days with fog or temperature inversions. Outdoor activities are generally more favorable during the wet season, although vigilance regarding mold and fungal spores is advised. The transition months of April and May can be unpredictable, with a mix of dry and wet conditions influencing air quality.