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Temoaya, nestled in the State of México, Mexico, occupies a strategically significant position within the sprawling Mexico City metropolitan area, yet retains a distinct rural character. Located at approximately 19.4686° latitude and -99.5933° longitude, the city sits at a considerable elevation of around 2,350 meters (7,710 feet) above sea level, placing it firmly within the high-altitude Mexican Plateau. This elevation profoundly influences its climate and, consequently, its air quality. The surrounding landscape is dominated by the Sierra de Guadalupe mountain range, a visually striking feature that contributes to localized weather patterns and can trap pollutants. While not directly adjacent to major bodies of water, Temoaya benefits from proximity to the Lerma River basin, which influences regional humidity and precipitation. The urban–rural gradient is noticeable; the city itself exhibits a mix of residential areas and small-scale agricultural activities, primarily focused on horticulture and livestock farming. Further out, the landscape transitions into more extensive agricultural fields and forested slopes. The city’s location within the heavily industrialized and densely populated Mexico City metropolitan area means it is susceptible to long-range transport of pollutants from the capital and surrounding industrial belts. Topography plays a crucial role; the valley setting can exacerbate air stagnation, particularly during periods of calm winds, leading to pollutant accumulation. The prevailing winds, often channeled through the mountain passes, can either disperse or concentrate pollutants depending on their direction and strength.

Temoaya’s air quality experiences a distinct seasonal cycle dictated by its climate and regional meteorological influences. The dry season, typically spanning from November to April, often presents the most challenging conditions. Reduced rainfall and lower humidity contribute to increased particulate matter concentrations, as dust and emissions are not effectively washed from the atmosphere. Temperature inversions, common during these months, trap pollutants near the ground, intensifying their impact. The months of December and January frequently see the poorest air quality due to a combination of these factors. Conversely, the wet season (May to October) brings relief, with frequent rainfall cleansing the air and dispersing pollutants. However, even during the wet season, localized agricultural burning practices can temporarily degrade air quality. Fog, particularly in the cooler months, can also exacerbate pollution by reducing atmospheric mixing. Wind patterns are crucial; periods of calm winds allow pollutants to accumulate, while stronger winds, especially those originating from the north, can bring cleaner air. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak pollution episodes. Agricultural workers should be particularly mindful of potential exposure to smoke from controlled burns. Maintaining indoor air quality through ventilation and air purification can also provide some protection. The transition months of April and October represent periods of fluctuating air quality, requiring vigilance and awareness of prevailing weather conditions.