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Ixtlahuacán de los Membrillos, nestled within the Guadalajara metropolitan area in Jalisco, Mexico, occupies a geographically significant position at approximately 20.35° N, 103.18° W. The city’s terrain is characterized by rolling hills and valleys, a typical feature of the Trans-Mexican Neovolcanic Belt, resulting in an elevation averaging around 1,530 meters (5,020 feet) above sea level. This altitude contributes to cooler temperatures compared to lower-lying regions, but also influences atmospheric stability and potential for temperature inversions. Ixtlahuacán sits on the western periphery of Guadalajara, exhibiting a distinct urban-rural gradient. To the west, agricultural lands, primarily dedicated to maize and agave cultivation, gradually transition into more sparsely populated areas. To the east, the sprawling urban fabric of Guadalajara dominates. The city’s proximity to Guadalajara, a major industrial and commercial hub, means it is inevitably affected by regional pollution patterns. While Ixtlahuacán itself has a moderate level of industrial activity, including some food processing and light manufacturing, the larger metropolitan area’s emissions are transported by prevailing winds. The surrounding landscape is a mix of agricultural fields, scattered rural communities, and patches of remnant forest, providing some natural filtration but also contributing to dust and particulate matter during dry periods. The lack of major surface water bodies within the immediate vicinity means humidity levels are generally low, which can exacerbate particulate matter dispersion. The topography creates localized microclimates, influencing pollutant concentrations within specific neighborhoods.

Ixtlahuacán de los Membrillos experiences a distinct wet and dry season pattern, significantly impacting air quality throughout the year. The dry season, typically spanning from November to April, is often characterized by lower humidity and increased sunshine, but also by a greater propensity for particulate matter pollution. Reduced rainfall means less atmospheric cleansing, and agricultural burning, a common practice in surrounding rural areas, contributes significantly to PM2.5 and PM10 levels. Temperature inversions, where a layer of warm air traps cooler air near the ground, are more frequent during this period, further concentrating pollutants. The months of January and February often see the highest concentrations of these particles. Conversely, the wet season (May to October) brings increased rainfall, which naturally washes pollutants from the atmosphere, leading to improved air quality. However, periods of heavy rain can also temporarily elevate ozone levels due to increased photochemical reactions. Fog, particularly during the cooler months, can trap pollutants near the ground, creating localized pockets of poor air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly on days with agricultural burning reported in nearby areas. Limiting outdoor exertion and wearing masks can provide some protection. During the wet season, while overall air quality is generally better, brief periods of elevated ozone warrant similar precautions, especially during sunny afternoons.