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Ojuelos de Jalisco, nestled within the state of Jalisco, Mexico, occupies a unique geographic position in the Los Altos region. Situated at coordinates 21.8667, -101.5833, the city sits at an elevation of approximately 2,277 meters (7,470 feet) above sea level, contributing to a cooler climate compared to lower-lying areas of Jalisco. The surrounding landscape is characterized by rolling hills and valleys, typical of the Mexican Plateau, with a noticeable transition from agricultural lands to more rugged terrain further afield. While not directly adjacent to a major body of water, the city is influenced by regional hydrological cycles and receives rainfall during the wet season. Ojuelos is largely a rural municipality, though the central town displays a concentrated urban character. The surrounding areas are dominated by agricultural activity, primarily focused on corn, beans, and agave cultivation for tequila production. This agricultural landscape, coupled with smaller-scale industrial activity related to food processing and manufacturing, significantly influences local air quality. The urban-rural gradient is pronounced, with air quality generally deteriorating closer to the town center due to increased traffic and concentrated emissions. The terrain’s elevation and the surrounding hills can also contribute to localized air stagnation, trapping pollutants during certain weather conditions.

Ojuelos de Jalisco 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 due to dust from agricultural activities and reduced rainfall to cleanse the air. January and February are often the months with the poorest air quality, exacerbated by temperature inversions common at this altitude, trapping pollutants near the ground. During these months, individuals with respiratory conditions should limit strenuous outdoor activity. The onset of the wet season in June brings a temporary improvement as rainfall washes away accumulated pollutants. However, increased humidity can also promote the formation of secondary pollutants. July and August, the peak of the rainy season, generally offer the best air quality, though localized flooding can stir up mold and allergens. September and October see a transition period, with decreasing rainfall and a gradual return to drier conditions, and a corresponding decline in air quality. The prevailing winds, generally from the northwest, can transport pollutants from regional sources. Fog, common during the cooler months, can also trap pollutants, reducing visibility and impacting respiratory health. Sensitive groups, including children and the elderly, should monitor conditions closely and take precautions during periods of poor air quality.