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Tala, Jalisco, nestled within the fertile highlands of western Mexico, occupies a geographically significant position within the Lake Chapala bioregion. Located approximately 45 kilometers northwest of Guadalajara, Mexico’s second-largest city, Tala’s coordinates (20.6667, -103.7000) place it at an elevation of roughly 1,520 meters (4,987 feet) above sea level. This altitude contributes to cooler temperatures compared to lower-lying areas and influences atmospheric stability. The surrounding landscape is characterized by rolling hills and valleys, a mosaic of agricultural fields (primarily maize, beans, and agave) and scattered rural settlements. To the south, the expansive Lake Chapala, Mexico’s largest natural lake, exerts a moderating influence on local climate, though its shrinking size in recent decades has reduced this effect. Tala’s urban character is that of a rapidly growing municipality, transitioning from a primarily agricultural town to a commuter suburb for Guadalajara. This growth is fueled by affordable housing and proximity to the metropolitan area. The urban–rural gradient is relatively sharp, with dense residential areas giving way quickly to agricultural land and smaller villages. The presence of agricultural activity, particularly the burning of crop residues after harvest, and increasing vehicular traffic associated with commuting contribute to localized air quality challenges. Furthermore, occasional industrial activity in nearby areas can impact Tala’s air quality, particularly during periods of stagnant air. The terrain, with its valleys and hills, can trap pollutants, exacerbating localized air quality issues.

Tala’s air quality experiences a distinct seasonal pattern dictated by its subtropical highland climate. The wet season, typically from June to September, brings increased rainfall and generally improved air quality due to atmospheric cleansing. Frequent rain showers wash away particulate matter, and higher humidity can help trap pollutants closer to the ground, reducing their dispersal. However, periods of intense rainfall can also lead to flooding and associated dust resuspension. The dry season, from October to May, presents a more complex picture. While sunshine is abundant, the lack of rainfall and lower humidity often lead to stagnant air conditions, particularly during temperature inversions, which frequently occur in November and February. These inversions trap pollutants near the ground, leading to potential air quality degradation. Agricultural burning, a common practice in the surrounding rural areas to clear fields for planting, significantly contributes to particulate matter pollution during this period. Wind patterns are generally light and variable throughout the year, but during the dry season, prolonged periods of calm air exacerbate the problem. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should exercise caution during these periods, limiting outdoor activity and avoiding areas with visible smoke. The months of February and March often experience the poorest air quality due to a combination of temperature inversions, agricultural burning, and reduced rainfall. Conversely, July and August typically offer the best air quality due to frequent rainfall and atmospheric cleansing.