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Tepeapulco, situated in the southeastern reaches of Hidalgo, Mexico, occupies a strategic position on the high-altitude Mexican Plateau at an elevation of approximately 2,500 meters above sea level. Its terrain is characterized by a rugged, semi-arid landscape dominated by volcanic remnants and undulating plains that define the local topography. The city functions as a pivotal urban node within the Apan region, acting as a transition zone between the industrialized corridors of the Valley of Mexico and the more agrarian, rural expanses of the central highlands. Geographically, its proximity to the Sierra de Hidalgo creates a rain shadow effect, significantly influencing the local microclimate and air dispersion patterns. The urban footprint is intimately tied to a legacy of heavy manufacturing, particularly automotive and metallurgical industries, which have historically concentrated along the town’s periphery. This industrial belt, coupled with the surrounding vast agricultural fields that often undergo seasonal burning, creates a unique atmospheric profile. The high elevation subjects the city to intense solar radiation, which drives complex photochemical reactions within the urban canopy. Furthermore, the basin-like nature of the surrounding topography can trap pollutants during periods of low wind, while the lack of large, moderating bodies of water exacerbates the diurnal temperature range. As the city navigates the urban–rural gradient, the interaction between industrial emissions and regional wind currents from the north becomes the primary determinant of air quality. Understanding Tepeapulco requires recognizing this delicate balance between its industrial heritage, high-altitude geography, and the vast, windswept plains that characterize its unique environmental setting.

Tepeapulco experiences a distinct climatic rhythm dictated by the interplay between the dry season and the summer monsoon, which profoundly shapes the city’s air quality narrative throughout the year. The dry season, spanning from November to April, presents the most significant challenges for air quality. During these months, the absence of precipitation allows particulate matter to remain suspended in the atmosphere, while frequent thermal inversions—common in the cool, clear nights of the high plateau—trap pollutants near the surface. Residents often notice higher concentrations of haze during the early morning hours, particularly in January and February, when cold air settles in the low-lying areas. As spring arrives, agricultural burning in the surrounding Apan plains contributes to a surge in smoke and fine particles, making this a period where sensitive individuals should prioritize indoor activities. Conversely, the arrival of the wet season in late May brings a welcome reprieve. The onset of convective rainfall effectively scrubs the atmosphere, washing away suspended dust and combustion byproducts, leading to the cleanest air of the year between June and September. During this period, the prevailing winds are more consistent, facilitating the dispersion of any localized emissions. However, as the rains taper off in October, the cycle resets. For those with respiratory sensitivities, it is advisable to monitor local conditions during the transition months of April and November. By favouring outdoor exercise during the late afternoon—when vertical mixing is at its peak—residents can better manage their exposure to the seasonal fluctuations inherent in this high-altitude environment.