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Zempoala, Hidalgo, nestled within the fertile Huasteca Potosina region of Mexico, occupies a geographically significant position at approximately 19.9153° latitude and -98.6689° longitude. The city’s terrain is characterized by rolling hills and valleys, a consequence of its location within the Sierra Madre Oriental mountain range. Elevation averages around 2,100 meters (6,889 feet) above sea level, contributing to cooler temperatures compared to lower-lying areas and influencing atmospheric stability. Zempoala sits within a transitional zone, exhibiting a gradual urban-rural gradient. To the west, agricultural lands, primarily dedicated to maize and bean cultivation, dominate the landscape, while to the east, the urban fabric of Pachuca, the state capital, becomes increasingly apparent. The nearby Tula River, though not directly adjacent to the city center, plays a crucial role in the regional hydrology and influences local microclimates. The surrounding landscape is a mosaic of agricultural fields, pine-oak forests, and scattered rural settlements. This proximity to both agricultural activity and a larger industrial hub (Pachuca and its surrounding mining operations) creates a complex interplay of potential pollution sources. The valley setting, while providing fertile land, can also trap pollutants, particularly during periods of atmospheric stability. Prevailing winds generally flow from the northeast, carrying potential contaminants from industrial zones to the west and northwest, impacting Zempoala’s air quality. The city’s growth, driven by its proximity to Pachuca and its own agricultural base, is steadily altering the rural-urban interface, further impacting local environmental conditions.

Zempoala’s air quality experiences a distinct seasonal pattern dictated by its subtropical highland climate. The dry season, typically spanning from November through April, often presents the most challenging conditions. Reduced rainfall leads to lower atmospheric moisture, hindering pollutant dispersion. Temperature inversions, common during these months, trap cooler air near the ground, effectively creating a lid that prevents pollutants from rising and dispersing. This phenomenon is exacerbated by the valley topography, which naturally restricts air movement. Agricultural burning, a traditional practice for land clearing and crop residue disposal, intensifies during this period, releasing significant particulate matter and contributing to hazy conditions. Conversely, the wet season (May to October) brings relief, with frequent rainfall washing pollutants from the atmosphere and increased humidity aiding in dispersion. However, periods of prolonged fog, particularly in the early morning hours, can temporarily reduce visibility and trap pollutants close to the ground. The months of February and March often see the highest concentrations of particulate matter due to a combination of agricultural burning and stable atmospheric conditions. Individuals with respiratory sensitivities, such as asthmatics and the elderly, should exercise caution during these periods, limiting outdoor exertion and monitoring local air quality reports. During the wet season, while overall air quality improves, periods of heavy rainfall can lead to increased mold and mildew, impacting indoor air quality and potentially triggering allergic reactions. Maintaining good ventilation and addressing moisture issues are crucial during these times.