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Los Reyes de Juárez, nestled within the state of Puebla, Mexico, occupies a strategically important position in the central highlands. Located at approximately 18.9458° latitude and -97.8058° longitude, the city’s elevation of around 2,150 meters (7,050 feet) above sea level significantly influences its climate and, consequently, its air quality. The surrounding landscape is characterized by rolling hills and valleys, typical of the Trans-Mexican Volcanic Belt, a region known for its fertile soils and agricultural activity. This proximity to agricultural zones, particularly those cultivating maize and other crops, introduces potential sources of particulate matter, especially during harvest seasons when burning agricultural residues is sometimes practiced. The urban–rural gradient transitions relatively quickly, with small-scale farming and rural communities bordering the city limits. While Los Reyes de Juárez isn't directly adjacent to major industrial centers, it sits within a region experiencing increasing urbanization and transportation demands, contributing to vehicular emissions. The city’s location within a basin can exacerbate air pollution episodes, as topography can impede the dispersion of pollutants. The lack of significant nearby large bodies of water further limits natural air cleansing mechanisms. The prevailing winds, often influenced by regional weather patterns, play a crucial role in determining the movement and concentration of airborne contaminants, making the city’s air quality sensitive to broader meteorological conditions and regional industrial activity.

The air quality in Los Reyes de Juárez exhibits a distinct seasonal pattern dictated by Puebla’s subtropical highland climate. The dry season, typically spanning from November to April, often sees a build-up of pollutants due to reduced rainfall and increased sunshine hours. Temperature inversions, common during these cooler months, trap pollutants near the ground, leading to periods of stagnant air and potentially elevated concentrations of particulate matter and ozone. February and March frequently experience these inversions, making them months to exercise caution, particularly for individuals with respiratory sensitivities. The wet season, from May to October, brings increased rainfall, which naturally helps to cleanse the atmosphere by washing away particulate matter. However, periods of intense rainfall can also lead to flooding and the release of pollutants from inundated areas. During the transition months (April and October), wind patterns become more variable, influencing pollutant dispersion. The agricultural cycle also impacts air quality; burning agricultural waste, though increasingly regulated, can still occur, releasing smoke and particulate matter into the air, especially during the harvest season (typically August-September). Sensitive groups, including children, the elderly, and those with pre-existing respiratory conditions, should monitor local air quality reports and limit outdoor activities during periods of stagnant air or high particulate matter concentrations. Maintaining indoor air quality through proper ventilation and air filtration is also advisable during these times.