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Pahuatlán de Valle, nestled within the verdant heart of Puebla, Mexico, occupies a geographically significant position in the Central Mexican Plateau. Located at approximately 20.2756° latitude and -98.1503° longitude, the city sits at an elevation of roughly 2,100 meters (6,889 feet) above sea level, contributing to a cooler climate compared to lower-lying regions. The surrounding landscape is dominated by the Sierra Norte de Puebla, a range of rugged mountains that significantly influence local weather patterns and air circulation. This mountainous terrain creates a natural basin, which, while beautiful, can also trap pollutants under certain meteorological conditions. Pahuatlán’s location within a valley means that air movement is often constrained, particularly during periods of calm weather. The city’s urban character is distinctly rural, with a strong agricultural presence in the immediate vicinity. The dominant land use is small-scale farming, primarily focused on maize, beans, and various fruits and vegetables. This agricultural activity, while vital to the local economy, can contribute to particulate matter pollution, especially during harvest seasons when burning agricultural waste is sometimes practiced. The urban–rural gradient is gradual, with small settlements and agricultural fields seamlessly blending into the city’s periphery. There are no major industrial belts directly adjacent to Pahuatlán, but the city’s proximity to larger urban centers like Puebla City means it can be affected by regional pollution transport, particularly during periods of unfavorable wind patterns. The lack of significant water bodies nearby further limits natural air purification processes.

Pahuatlán de Valle experiences a distinct wet and dry season pattern, profoundly impacting its air quality. The dry season, typically spanning from November to April, is characterized by lower rainfall and increased sunshine. However, this period often sees a rise in particulate matter pollution. The lack of rainfall means fewer opportunities for atmospheric cleansing, and the drier air promotes the suspension of dust and other particles. Temperature inversions, common during the cooler nights of the dry season, trap pollutants close to the ground, exacerbating the problem. Agricultural burning, though ideally regulated, can also contribute significantly during this time. The wet season, from May to October, brings increased rainfall and higher humidity, naturally washing away pollutants and improving air quality. Monsoon-like conditions, though not as intense as in other parts of Mexico, still contribute to this cleansing effect. Fog, particularly in the mornings during the transition periods between seasons, can temporarily reduce visibility and trap pollutants, but generally, the increased precipitation outweighs this effect. Outdoor activities are generally more favorable during the wet season, particularly from June to September. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, especially on days with calm winds or visible haze. While the wet season offers respite, periods of intense rainfall can sometimes lead to increased mold and mildew, which can also affect indoor air quality. Maintaining good ventilation and addressing moisture issues are crucial during these times.