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Encarnación de Díaz, nestled within the state of Jalisco, Mexico, occupies a geographically complex position that significantly influences its air quality. Located at coordinates 21.5167, -102.2333, the city sits within the Los Altos de Jalisco region, a high plateau characterized by rolling hills and valleys. The terrain is not entirely flat, contributing to localized variations in air circulation. With a population of approximately 51,396, Encarnación de Díaz exhibits a typical urban-rural gradient, transitioning from denser residential and commercial areas in the city center to surrounding agricultural lands. The primary economic activity revolves around agriculture, particularly maize and agave cultivation, alongside small-scale livestock farming. This agricultural activity, while vital to the local economy, introduces potential sources of particulate matter from field preparation, harvesting, and the use of agricultural machinery. The city isn’t directly adjacent to large bodies of water, but benefits from smaller rivers and streams originating in the surrounding hills. While not a major industrial hub, the presence of smaller workshops and processing facilities contributes to localized emissions. The elevation, averaging around 1,700 meters above sea level, impacts atmospheric density and pollutant dispersion, potentially exacerbating certain pollution events. The surrounding landscape, dominated by hills and agricultural fields, limits long-range pollutant transport, concentrating emissions within the valley.

Encarnación de Díaz experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, typically from November to May, sees a marked increase in particulate matter. Reduced rainfall means less atmospheric cleansing, and drier conditions facilitate the suspension of dust from agricultural activities and unpaved roads. Temperature inversions are common during the cooler mornings of the dry season, trapping pollutants near the ground. February and March are often the months with the poorest air quality. The onset of the wet season in June brings a significant improvement. Frequent rainfall effectively washes pollutants from the atmosphere, and increased humidity reduces dust suspension. However, increased cloud cover can also lead to stagnant air conditions. August and September, the peak of the rainy season, generally offer the best air quality. Sensitive groups, such as children, the elderly, and those with respiratory conditions, should limit strenuous outdoor activity during the dry season, particularly in the mornings. During the wet season, while air quality is generally better, monitoring for potential mold growth indoors is advisable. Wind patterns, generally from the north during the dry season and shifting to the south during the wet season, play a crucial role in pollutant dispersion, though the surrounding hills limit their effectiveness.