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Ixtlahuacán del Río, Jalisco, nestled within the dynamic metropolitan area of Guadalajara, occupies a geographically significant position in the western Mexican highlands. Located at approximately 20.8667° N, 103.25° W and an elevation of around 1,500 meters (4,921 feet) above sea level, the city’s terrain is characterized by gently sloping valleys and rolling hills, part of the broader Lerma-Chapala River basin. This basin, fed by the Rio Grande de Santiago, influences local hydrology and contributes to the region’s agricultural productivity. The surrounding landscape is a mosaic of agricultural fields – primarily maize, agave, and various fruits – interspersed with scattered rural settlements and patches of remnant mesophilic forest. Ixtlahuacán del Río exhibits a clear urban–rural gradient, transitioning from denser residential areas closer to Guadalajara to more agrarian landscapes further out. Its proximity to Guadalajara, Mexico’s second-largest city, means it’s subject to urban sprawl and the associated pressures. The Lerma-Chapala River, while providing a water source, can also act as a conduit for pollutants. The city’s location within a basin, coupled with the surrounding topography, can exacerbate air quality issues by trapping pollutants, particularly during periods of atmospheric stability. Industrial activity, concentrated in and around Guadalajara, contributes to regional air pollution, with some of these emissions impacting Ixtlahuacán del Río. The prevailing winds, often influenced by regional weather patterns, play a crucial role in dispersing or concentrating these pollutants.

Ixtlahuacán del Río experiences a distinct wet and dry season pattern, significantly impacting its air quality. The dry season, typically spanning from November to April, is often characterized by lower rainfall and increased sunshine, but also by a greater propensity for temperature inversions. These inversions, where a layer of warm air traps cooler air near the ground, prevent the vertical dispersion of pollutants, leading to elevated concentrations, particularly of particulate matter. Dust from agricultural activities, intensified by drier conditions and wind erosion, further contributes to this problem. The months of February and March often see the most persistent inversions and associated air quality challenges. Conversely, the wet season (May to October) brings increased rainfall, which naturally scavenges pollutants from the atmosphere, leading to improved air quality. However, heavy rainfall events can also mobilize dust and contribute to localized flooding, potentially releasing pollutants from contaminated sites. During the wet season, humidity tends to be higher, which can exacerbate respiratory issues for sensitive individuals. The intensity of the monsoon-like rains varies year to year, influencing the overall effectiveness of atmospheric cleansing. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during periods of stagnant air. Increased ventilation and air filtration within homes can also provide some relief. The transition months of May and October can be unpredictable, with fluctuating rainfall and temperature patterns, requiring vigilance regarding air quality conditions.